Fix a Link for 'User Guide' in README.md
Fix a Link for 'User Guide' in README.md

### What is this PR for?
Just fixed a dead link in Zeppelin `README.md` file.

### What type of PR is it?
Documentation

### Todos
* [x] - Change a link `http://zeppelin.incubator.apache.org/docs/index.html` to `http://zeppelin.incubator.apache.org/docs/latest/index.html`.

### Is there a relevant Jira issue?
No

### How should this be tested?
Just click the <code> **Documentation:** User Guide </code> in Zeppelin `README.md`.

### Screenshots (if appropriate)

### Questions:
* Does the licenses files need update? No
* Is there breaking changes for older versions? No
* Does this needs documentation? No

Author: Ryu Ah young <fbdkdud93@hanmail.net>

Closes #651 from AhyoungRyu/Fix-README and squashes the following commits:

2e27cf1 [Ryu Ah young] Fix a Link for 'User Guide' in README.md

wary/zeppelin,cquptEthan/incubator-zeppelin,Leemoonsoo/zeppelin,hkropp/incubator-zeppelin,brigade/incubator-zeppelin,onkarshedge/incubator-zeppelin,swakrish/incubator-zeppelin,volumeint/zeppelin,apache/zeppelin,hammertank/zeppelin,AlexanderShoshin/zeppelin,nikste/incubator-zeppelin,zetaris/zeppelin,cjmatta/incubator-zeppelin,lresende/incubator-zeppelin,pravin-dsilva/zeppelin,apache/incubator-zeppelin,cris83/incubator-zeppelin,samuel-pt/incubator-zeppelin,prabhjyotsingh/zeppelin,zjffdu/zeppelin,mwpenny/zeppelin-esri,vipul1409/zeppelin,doanduyhai/incubator-zeppelin,radicalbit/incubator-zeppelin,swakrish/incubator-zeppelin,pravin-dsilva/zeppelin,ravicodder/incubator-zeppelin,wary/zeppelin,SarunasG/zeppelin-oidc,IceKhan13/zeppelin,VipinRathor/zeppelin,suvam97/zeppelin,granturing/incubator-zeppelin,ravicodder/incubator-zeppelin,cjmatta/incubator-zeppelin,hammertank/zeppelin,Leemoonsoo/zeppelin,prabhjyotsingh/zeppelin,mfelgamal/zeppelin,namanmishra91/zeppelin,benoyantony/zeppelin,Leemoonsoo/zeppelin,benoyantony/zeppelin,mwkang/zeppelin,prasadwagle/incubator-zeppelin,mwkang/zeppelin,openthings/zeppelin,r-kamath/zeppelin,wary/zeppelin,vgmartinez/incubator-zeppelin,rerngvit/incubator-zeppelin,raysteam/zeppelin,SarunasG/zeppelin-oidc,Leemoonsoo/incubator-zeppelin,datalayer/zeppelin-datalayer,vrajat/incubator-zeppelin,YuanGunGun/zeppelin,vrlo/zeppelin,namanmishra91/zeppelin,karuppayya/zeppelin,zetaris/zeppelin,AlexanderShoshin/zeppelin,jlagarden/zeppelin,benoyantony/zeppelin,karuppayya/zeppelin,minahlee/zeppelin,VipinRathor/zeppelin,ravicodder/incubator-zeppelin,r-kamath/incubator-zeppelin,prasadwagle/incubator-zeppelin,prabhjyotsingh/incubator-zeppelin,anthonycorbacho/incubator-zeppelin,volumeint/zeppelin,mwpenny/zeppelin-esri,digitalreasoning/incubator-zeppelin,samuel-pt/incubator-zeppelin,cris83/incubator-zeppelin,lresende/incubator-zeppelin,herval/zeppelin,HeartSaVioR/incubator-zeppelin,MikeTYChen/incubator-zeppelin,vipul1409/zeppelin,tillrohrmann/incubator-zeppelin,r-kamath/zeppelin,MikeTYChen/incubator-zeppelin,hkropp/incubator-zeppelin,lobamba/zeppelin,cquptEthan/incubator-zeppelin,vrajat/incubator-zeppelin,yu74n/zeppelin,sohaibiftikhar/zeppelin,granturing/incubator-zeppelin,igorborojevic/incubator-zeppelin,minahlee/incubator-zeppelin,astroshim/incubator-zeppelin,samuel-pt/incubator-zeppelin,prabhjyotsingh/incubator-zeppelin,ravicodder/incubator-zeppelin,1ambda/zeppelin,yorek/zeppelin,SachinJanani/zeppelin,mwkang/zeppelin,jongyoul/incubator-zeppelin,optimizely/incubator-zeppelin,datalayer/zeppelin-R,volumeint/zeppelin,Solution-Global/zeppelin,joroKr21/incubator-zeppelin,rerngvit/incubator-zeppelin,zjffdu/zeppelin,astroshim/incubator-zeppelin,rlugojr/incubator-zeppelin,Madhuka/incubator-zeppelin,onkarshedge/incubator-zeppelin,igorborojevic/incubator-zeppelin,volumeint/zeppelin,granturing/incubator-zeppelin,raysteam/zeppelin,prabhjyotsingh/incubator-zeppelin,Madhuka/incubator-zeppelin,benoyantony/zeppelin,Leemoonsoo/zeppelin,Altiscale/incubator-zeppelin,HeartSaVioR/incubator-zeppelin,YuanGunGun/zeppelin,ankurmitujjain/incubator-zeppelin,rerngvit/incubator-zeppelin,AlexanderShoshin/zeppelin,chilang/zeppelin,sravan-s/zeppelin,mwkang/zeppelin,chilang/zeppelin,mwpenny/zeppelin-esri,doanduyhai/incubator-zeppelin,granturing/incubator-zeppelin,minahlee/incubator-zeppelin,mfelgamal/zeppelin,digitalreasoning/incubator-zeppelin,chilang/zeppelin,IceKhan13/zeppelin,swakrish/incubator-zeppelin,doanduyhai/incubator-zeppelin,yu74n/zeppelin,spacewalkman/incubator-zeppelin,AlexanderShoshin/zeppelin,joroKr21/incubator-zeppelin,datalayer/zeppelin-R,rerngvit/incubator-zeppelin,mwpenny/zeppelin-esri,hammertank/zeppelin,Madhuka/incubator-zeppelin,sergeymazin/zeppelin,pellmont/zeppelin,cris83/incubator-zeppelin,suvam97/zeppelin,joroKr21/incubator-zeppelin,1ambda/zeppelin,radicalbit/incubator-zeppelin,datalayer/zeppelin,raysteam/zeppelin,Solution-Global/zeppelin,apache/incubator-zeppelin,herval/zeppelin,swakrish/incubator-zeppelin,anthonycorbacho/incubator-zeppelin,rlugojr/incubator-zeppelin,openthings/zeppelin,sergeymazin/zeppelin,tzolov/incubator-zeppelin,lresende/incubator-zeppelin,jlagarden/zeppelin,herval/zeppelin,Leemoonsoo/incubator-zeppelin,minahlee/zeppelin,spacewalkman/incubator-zeppelin,samuel-pt/incubator-zeppelin,cfries/zeppelin,chilang/zeppelin,yorek/zeppelin,cjmatta/incubator-zeppelin,openthings/zeppelin,pravin-dsilva/zeppelin,zjffdu/zeppelin,onkarshedge/incubator-zeppelin,IceKhan13/zeppelin,datalayer/zeppelin,SachinJanani/zeppelin,lobamba/zeppelin,ankurmitujjain/incubator-zeppelin,openthings/zeppelin,vipul1409/zeppelin,datalayer/zeppelin-R,rlugojr/incubator-zeppelin,wary/zeppelin,apache/zeppelin,suvam97/zeppelin,Leemoonsoo/zeppelin,volumeint/zeppelin,vipul1409/zeppelin,ankurmitujjain/incubator-zeppelin,sohaibiftikhar/zeppelin,cquptEthan/incubator-zeppelin,IceKhan13/zeppelin,VipinRathor/zeppelin,SachinJanani/zeppelin,optimizely/incubator-zeppelin,SarunasG/zeppelin-oidc,minahlee/incubator-zeppelin,benoyantony/zeppelin,ravicodder/incubator-zeppelin,sagarkulkarni3592/incubator-zeppelin,joroKr21/incubator-zeppelin,yorek/zeppelin,prasadwagle/incubator-zeppelin,fogbeam/zeppelin_mirror,sctincman/zeppelin,jlagarden/zeppelin,tillrohrmann/incubator-zeppelin,optimizely/incubator-zeppelin,zetaris/zeppelin,yorek/zeppelin,digitalreasoning/incubator-zeppelin,sctincman/zeppelin,pellmont/zeppelin,lobamba/zeppelin,vrajat/incubator-zeppelin,karuppayya/zeppelin,prabhjyotsingh/zeppelin,tillrohrmann/incubator-zeppelin,jongyoul/zeppelin,datalayer/zeppelin-datalayer,openthings/zeppelin,cjmatta/incubator-zeppelin,jlagarden/zeppelin,rlugojr/incubator-zeppelin,spacewalkman/incubator-zeppelin,namanmishra91/zeppelin,volumeint/zeppelin,RamVenkatesh/incubator-zeppelin,sravan-s/zeppelin,anthonycorbacho/incubator-zeppelin,zetaris/zeppelin,cfries/zeppelin,apache/zeppelin,sohaibiftikhar/zeppelin,HeartSaVioR/incubator-zeppelin,vrlo/zeppelin,raysteam/zeppelin,SarunasG/zeppelin-oidc,1ambda/zeppelin,datalayer/zeppelin-R,tzolov/incubator-zeppelin,benoyantony/zeppelin,tillrohrmann/incubator-zeppelin,cfries/zeppelin,nikste/incubator-zeppelin,vipul1409/zeppelin,astroshim/incubator-zeppelin,wary/zeppelin,sctincman/zeppelin,tillrohrmann/incubator-zeppelin,igorborojevic/incubator-zeppelin,joroKr21/incubator-zeppelin,datalayer/zeppelin-R,sravan-s/zeppelin,radicalbit/incubator-zeppelin,jongyoul/zeppelin,minahlee/incubator-zeppelin,YuanGunGun/zeppelin,zjffdu/zeppelin,SarunasG/zeppelin-oidc,Leemoonsoo/incubator-zeppelin,IceKhan13/zeppelin,HeartSaVioR/incubator-zeppelin,spacewalkman/incubator-zeppelin,Leemoonsoo/incubator-zeppelin,zetaris/zeppelin,RamVenkatesh/incubator-zeppelin,mwpenny/zeppelin-esri,chilang/zeppelin,spacewalkman/incubator-zeppelin,sravan-s/zeppelin,tinkoff-dwh/zeppelin,rerngvit/incubator-zeppelin,Nova-Boy/zeppelin,lresende/incubator-zeppelin,Altiscale/incubator-zeppelin,SarunasG/zeppelin-oidc,Madhuka/incubator-zeppelin,1ambda/zeppelin,r-kamath/zeppelin,yorek/zeppelin,brigade/incubator-zeppelin,rconline/zeppelin,cquptEthan/incubator-zeppelin,spacewalkman/incubator-zeppelin,digitalreasoning/incubator-zeppelin,samuel-pt/incubator-zeppelin,prasadwagle/incubator-zeppelin,wary/zeppelin,vrlo/zeppelin,minahlee/zeppelin,granturing/incubator-zeppelin,sagarkulkarni3592/incubator-zeppelin,SarunasG/zeppelin-oidc,Nova-Boy/zeppelin,prabhjyotsingh/incubator-zeppelin,rconline/zeppelin,fogbeam/zeppelin_mirror,optimizely/incubator-zeppelin,radicalbit/incubator-zeppelin,raysteam/zeppelin,cquptEthan/incubator-zeppelin,datalayer/zeppelin-datalayer,r-kamath/incubator-zeppelin,YuanGunGun/zeppelin,apache/incubator-zeppelin,jongyoul/zeppelin,minahlee/zeppelin,tinkoff-dwh/zeppelin,mwpenny/zeppelin-esri,sergeymazin/zeppelin,RamVenkatesh/incubator-zeppelin,anthonycorbacho/incubator-zeppelin,benoyantony/zeppelin,r-kamath/incubator-zeppelin,1ambda/zeppelin,minahlee/zeppelin,hammertank/zeppelin,soralee/zeppelin,jongyoul/incubator-zeppelin,doanduyhai/incubator-zeppelin,ankurmitujjain/incubator-zeppelin,MikeTYChen/incubator-zeppelin,sergeymazin/zeppelin,namanmishra91/zeppelin,digitalreasoning/incubator-zeppelin,datalayer/zeppelin,igorborojevic/incubator-zeppelin,SachinJanani/zeppelin,astroshim/zeppelin,r-kamath/incubator-zeppelin,zjffdu/zeppelin,cfries/zeppelin,soralee/zeppelin,namanmishra91/zeppelin,zetaris/zeppelin,karuppayya/zeppelin,Solution-Global/zeppelin,karuppayya/zeppelin,1ambda/zeppelin,r-kamath/zeppelin,nikste/incubator-zeppelin,mwkang/zeppelin,HeartSaVioR/incubator-zeppelin,igorborojevic/incubator-zeppelin,namanmishra91/zeppelin,cquptEthan/incubator-zeppelin,granturing/incubator-zeppelin,ravicodder/incubator-zeppelin,herval/zeppelin,joroKr21/incubator-zeppelin,yu74n/zeppelin,vipul1409/zeppelin,Solution-Global/zeppelin,sergeymazin/zeppelin,prabhjyotsingh/incubator-zeppelin,jongyoul/incubator-zeppelin,mwkang/zeppelin,onkarshedge/incubator-zeppelin,nikste/incubator-zeppelin,apache/zeppelin,cjmatta/incubator-zeppelin,Nova-Boy/zeppelin,lresende/incubator-zeppelin,anthonycorbacho/incubator-zeppelin,prabhjyotsingh/incubator-zeppelin,YuanGunGun/zeppelin,tzolov/incubator-zeppelin,doanduyhai/incubator-zeppelin,vgmartinez/incubator-zeppelin,VipinRathor/zeppelin,tinkoff-dwh/zeppelin,HeartSaVioR/incubator-zeppelin,mfelgamal/zeppelin,suvam97/zeppelin,fogbeam/zeppelin_mirror,lresende/incubator-zeppelin,Solution-Global/zeppelin,zetaris/zeppelin,datalayer/zeppelin,Solution-Global/zeppelin,Leemoonsoo/incubator-zeppelin,pellmont/zeppelin,datalayer/zeppelin-R,ankurmitujjain/incubator-zeppelin,cfries/zeppelin,jongyoul/zeppelin,ankurmitujjain/incubator-zeppelin,wary/zeppelin,Madhuka/incubator-zeppelin,rconline/zeppelin,soralee/zeppelin,onkarshedge/incubator-zeppelin,astroshim/incubator-zeppelin,ankurmitujjain/incubator-zeppelin,suvam97/zeppelin,apache/zeppelin,hammertank/zeppelin,astroshim/zeppelin,Leemoonsoo/zeppelin,sctincman/zeppelin,radicalbit/incubator-zeppelin,cris83/incubator-zeppelin,Madhuka/incubator-zeppelin,rconline/zeppelin,digitalreasoning/incubator-zeppelin,rconline/zeppelin,swakrish/incubator-zeppelin,lobamba/zeppelin,astroshim/zeppelin,r-kamath/incubator-zeppelin,pellmont/zeppelin,tinkoff-dwh/zeppelin,vgmartinez/incubator-zeppelin,anthonycorbacho/incubator-zeppelin,vrlo/zeppelin,datalayer/zeppelin,VipinRathor/zeppelin,sctincman/zeppelin,Solution-Global/zeppelin,doanduyhai/incubator-zeppelin,cfries/zeppelin,r-kamath/zeppelin,rlugojr/incubator-zeppelin,sergeymazin/zeppelin,datalayer/zeppelin-datalayer,tinkoff-dwh/zeppelin,pravin-dsilva/zeppelin,sagarkulkarni3592/incubator-zeppelin,prabhjyotsingh/zeppelin,raysteam/zeppelin,sohaibiftikhar/zeppelin,jlagarden/zeppelin,vrajat/incubator-zeppelin,brigade/incubator-zeppelin,doanduyhai/incubator-zeppelin,apache/incubator-zeppelin,prasadwagle/incubator-zeppelin,AlexanderShoshin/zeppelin,sohaibiftikhar/zeppelin,RamVenkatesh/incubator-zeppelin,yorek/zeppelin,prasadwagle/incubator-zeppelin,brigade/incubator-zeppelin,optimizely/incubator-zeppelin,vipul1409/zeppelin,onkarshedge/incubator-zeppelin,YuanGunGun/zeppelin,rconline/zeppelin,chilang/zeppelin,rconline/zeppelin,jongyoul/zeppelin,sohaibiftikhar/zeppelin,RamVenkatesh/incubator-zeppelin,karuppayya/zeppelin,hkropp/incubator-zeppelin,fogbeam/zeppelin_mirror,Altiscale/incubator-zeppelin,mfelgamal/zeppelin,r-kamath/zeppelin,sagarkulkarni3592/incubator-zeppelin,Leemoonsoo/zeppelin,r-kamath/zeppelin,vrajat/incubator-zeppelin,tinkoff-dwh/zeppelin,sctincman/zeppelin,prabhjyotsingh/zeppelin,yu74n/zeppelin,volumeint/zeppelin,AlexanderShoshin/zeppelin,karuppayya/zeppelin,SachinJanani/zeppelin,pellmont/zeppelin,chilang/zeppelin,zjffdu/zeppelin,prabhjyotsingh/zeppelin,mfelgamal/zeppelin,vrlo/zeppelin,soralee/zeppelin,mwpenny/zeppelin-esri,sravan-s/zeppelin,pravin-dsilva/zeppelin,rerngvit/incubator-zeppelin,radicalbit/incubator-zeppelin,minahlee/incubator-zeppelin,pravin-dsilva/zeppelin,vrlo/zeppelin,optimizely/incubator-zeppelin,lobamba/zeppelin,Leemoonsoo/zeppelin,soralee/zeppelin,mwkang/zeppelin,soralee/zeppelin,vgmartinez/incubator-zeppelin,sagarkulkarni3592/incubator-zeppelin,MikeTYChen/incubator-zeppelin,IceKhan13/zeppelin,jongyoul/incubator-zeppelin,Nova-Boy/zeppelin,nikste/incubator-zeppelin,brigade/incubator-zeppelin,datalayer/zeppelin,pellmont/zeppelin,IceKhan13/zeppelin,vgmartinez/incubator-zeppelin,cquptEthan/incubator-zeppelin,mfelgamal/zeppelin,jlagarden/zeppelin,VipinRathor/zeppelin,tinkoff-dwh/zeppelin,sravan-s/zeppelin,ravicodder/incubator-zeppelin,jongyoul/zeppelin,hkropp/incubator-zeppelin,Altiscale/incubator-zeppelin,namanmishra91/zeppelin,granturing/incubator-zeppelin,openthings/zeppelin,prabhjyotsingh/zeppelin,VipinRathor/zeppelin,sohaibiftikhar/zeppelin,yu74n/zeppelin,pellmont/zeppelin,hammertank/zeppelin,optimizely/incubator-zeppelin,digitalreasoning/incubator-zeppelin,astroshim/zeppelin,vrlo/zeppelin,openthings/zeppelin,SachinJanani/zeppelin,zjffdu/zeppelin,AlexanderShoshin/zeppelin,hammertank/zeppelin,jlagarden/zeppelin,r-kamath/incubator-zeppelin,vgmartinez/incubator-zeppelin,minahlee/zeppelin,astroshim/zeppelin,suvam97/zeppelin,sagarkulkarni3592/incubator-zeppelin,lresende/incubator-zeppelin,suvam97/zeppelin,apache/zeppelin,Nova-Boy/zeppelin,prasadwagle/incubator-zeppelin,Leemoonsoo/incubator-zeppelin,joroKr21/incubator-zeppelin,rlugojr/incubator-zeppelin,yu74n/zeppelin,tillrohrmann/incubator-zeppelin,cjmatta/incubator-zeppelin,apache/incubator-zeppelin,MikeTYChen/incubator-zeppelin,fogbeam/zeppelin_mirror,Altiscale/incubator-zeppelin,cris83/incubator-zeppelin,lobamba/zeppelin,astroshim/incubator-zeppelin,lobamba/zeppelin,astroshim/zeppelin,fogbeam/zeppelin_mirror,vrajat/incubator-zeppelin,igorborojevic/incubator-zeppelin,mfelgamal/zeppelin,jongyoul/zeppelin,samuel-pt/incubator-zeppelin,minahlee/zeppelin,sagarkulkarni3592/incubator-zeppelin,astroshim/incubator-zeppelin,herval/zeppelin,soralee/zeppelin,brigade/incubator-zeppelin,tzolov/incubator-zeppelin,herval/zeppelin,Altiscale/incubator-zeppelin,tillrohrmann/incubator-zeppelin,brigade/incubator-zeppelin,RamVenkatesh/incubator-zeppelin,pravin-dsilva/zeppelin,yorek/zeppelin,nikste/incubator-zeppelin,jongyoul/incubator-zeppelin,yu74n/zeppelin,Madhuka/incubator-zeppelin,YuanGunGun/zeppelin,sravan-s/zeppelin,apache/incubator-zeppelin,onkarshedge/incubator-zeppelin,hkropp/incubator-zeppelin,hkropp/incubator-zeppelin,rerngvit/incubator-zeppelin,r-kamath/incubator-zeppelin,apache/zeppelin,sergeymazin/zeppelin,sctincman/zeppelin,astroshim/zeppelin,MikeTYChen/incubator-zeppelin,jongyoul/incubator-zeppelin,tzolov/incubator-zeppelin,cfries/zeppelin,datalayer/zeppelin,Nova-Boy/zeppelin,herval/zeppelin,raysteam/zeppelin,spacewalkman/incubator-zeppelin,tzolov/incubator-zeppelin,swakrish/incubator-zeppelin,Nova-Boy/zeppelin,cris83/incubator-zeppelin,1ambda/zeppelin,joroKr21/incubator-zeppelin,fogbeam/zeppelin_mirror,radicalbit/incubator-zeppelin,SachinJanani/zeppelin,anthonycorbacho/incubator-zeppelin