Update README.md for fixing ignite flag
Update README.md for fixing ignite flag

### What is this PR for?
While Apache Ignite version in Zeppelin was bumped up by #916, but ignite build flag in [README.md](https://github.com/apache/incubator-zeppelin/blob/master/README.md#ignite-interpreter) is outdated so far. So I just changed `1.1.0-incubating` -> `1.6.0`.

### What type of PR is it?
Hot Fix

### Todos

### What is the Jira issue?

### How should this be tested?
Just see [here](https://github.com/apache/incubator-zeppelin/blob/master/README.md#ignite-interpreter).

### 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: AhyoungRyu <fbdkdud93@hanmail.net>

Closes #970 from AhyoungRyu/update/README.md and squashes the following commits:

20d0155 [AhyoungRyu] Update README.md for fixing ignite flag

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