feat(README): add note about the license
feat(README): add note about the license

gouyang/etcd,ajityagaty/etcd,axingblog/etcd,zaphod-concur/etcd,mitake/etcd,coreos/etcd,sinsharat/etcd,gae123/etcd,chipironcin/etcd,gyuho/etcd,mickep76/etcd,xiang90/etcd,akauppi/etcd,xdlinear/etcd,mqliang/etcd,msanterre/etcd,hroyrh/etcd,whuwxl/etcd,steveeJ/etcd,freeloop1114/etcd,etcd-io/etcd,gyuho/etcd,CrazyJvm/etcd,Winslett/etcd,lumjjb/etcd,CrazyJvm/etcd,dalanlan/etcd,HideoYamauchi/etcd,rchicoli/etcd,armstrongli/etcd,mickep76/etcd,gosharplite/etcd,mike-lerch/etcd,jeremyeder/etcd,chipironcin/etcd,hpcloud/etcd,zaphod-concur/etcd,Ulexus/etcd,hpcloud/etcd,svdata/etcd,glycerine/etcd,glensc/etcd,siddontang/etcd,jlamillan/etcd,fasaxc/etcd,yichengq/etcd,jchauncey/etcd,shafreeck/etcd,sayden/etcd,visheshnp/etcd,heyitsanthony/etcd,endocode/etcd,SivagnanamCiena/etcd,offscale/etcd,tangkun75/etcd,bdarnell/etcd,justintung/etcd,mitake/etcd,coreos/etcd,chai2010-playground/etcd,achanda/etcd,spotify/etcd,kingland/etcd,wantonsolutions/dinv-etcd,youxidev/etcd,plasticbox/etcd,wowsoso/etcd,fanminshi/etcd,polvi/etcd,imzhulei/etcd,gtank/etcd,wfxiang08/etcd,asim/etcd,Timer/etcd,cvik/etcd,onlyjob/etcd,cvik/etcd,giantswarm/etcd,njucslqq/etcd,pauldallen/etcd,beni55/etcd,pengzj/etcd,ravigadde/etcd,mischief/etcd,junxu/etcd,chenbaihu/etcd,qqsun8819/etcd,purpleidea/etcd,justintung/etcd,joshix/etcd,offscale/etcd,YuleiXiao/etcd,ajityagaty/etcd,purpleidea/etcd,mischief/etcd,glensc/etcd,openedbox/etcd,Ulexus/etcd,linuxcer/etcd,insequent/etcd,freeloop1114/etcd,insionng/etcd,mkumatag/etcd,tempbottle/etcd,mwitkow-io/etcd,rnaveiras/etcd,cloudfoundry/etcd,armstrongli/etcd,ravigadde/etcd,mqliang/etcd,wfxiang08/etcd,cloudfoundry/etcd,ecnahc515/etcd,crandles/etcd,sayden/etcd,hongchaodeng/etcd,linuxcer/etcd,improbable-io/etcd,princeqjzh/etcd,siddontang/etcd,Winslett/etcd,bakins/etcd,Ulexus/etcd,tguangch/etcd,gtank/etcd,ecnahc515/etcd,dterei/etcd,steveeJ/etcd,cvik/etcd,openedbox/etcd,combk8s/etcd,delkyd/etcd,nkhare/etcd,cognusion/etcd,elimisteve/etcd,lzbgt/etcd,glevand/coreos--etcd,fanminshi/etcd,gouyang/etcd,Eagle-X/etcd,improbable-io/etcd,cvik/etcd,hongbinz/etcd,cloudfoundry/etcd,Timer/etcd,Eagle-X/etcd,shafreeck/etcd,jravetch/etcd,msanterre/etcd,a-robinson/etcd,dalanlan/etcd,Ulexus/etcd,snailwalker/etcd,jlamillan/etcd,lorneli/etcd,shawnps/etcd,jefby/etcd,raoofm/etcd,insionng/etcd,robszumski/etcd,tguangch/etcd,axingblog/etcd,hongbinz/etcd,nieanan/etcd,achanda/etcd,lzbgt/etcd,devfreesg/etcd,spacejam/etcd,bspline/etcd,shakefu/etcd,lorneli/etcd,etcd-io/etcd,fasaxc/etcd,plasticbox/etcd,robszumski/etcd,kkaneda/etcd,mkumatag/etcd,csuideal/etcd,yudai/etcd,princeqjzh/etcd,ktateish/etcd,yichengq/etcd,jeremyeder/etcd,QuantiumTechnology/etcd,qqsun8819/etcd,handsomesun/etcd,qiaochao911/etcd,wantonsolutions/dinv-etcd,sofuture/etcd,vimalk78/etcd,luxas/etcd,gityf/etcd,sinsharat/etcd,philips/etcd,sebrandon1/etcd,shakefu/etcd,lumjjb/etcd,pengzj/etcd,xychu/etcd,sebschrader/etcd,chai2010/etcd,swingbach/etcd,YuleiXiao/etcd,glycerine/etcd,mkumatag/etcd,wantonsolutions/dinv-etcd,a-robinson/etcd,xebitstudios/etcd,StorReduce/etcd,mgoelzer/etcd-fork2,chai2010-playground/etcd,xdlinear/etcd,gityf/etcd,endocode/etcd,crandles/etcd,buaazp/etcd,dnaeon/etcd,iamqizhao/etcd,cockroachdb/etcd,sebrandon1/etcd,mqliang/etcd,hzy001/etcd,barakmich/etcd,philips/etcd,imzhulei/etcd,jonboulle/etcd,whuwxl/etcd,mwitkow-io/etcd,bluebreezecf/etcd,xueshanf/etcd,li-ang/etcd,mwitkow/etcd,mike-lerch/etcd,fgbreel/etcd,glevand/coreos--etcd,bspline/etcd,olark/etcd,bdarnell/etcd,ajityagaty/etcd,xiang90/etcd,yyljlyy/etcd,dannysauer/etcd,combk8s/etcd,jmptrader/etcd,cognusion/etcd,arthurcolle/etcd,oscarrr110/etcd,onlyjob/etcd,csuideal/etcd,dterei/etcd,giantswarm/etcd,nekto0n/etcd,snailwalker/etcd,delkyd/etcd,asim/etcd,westhood/etcd,visheshnp/etcd,sebschrader/etcd,mgoelzer/etcd-fork2,njharman/etcd,es-chow/etcd,jchauncey/etcd,nkhare/etcd,fgbreel/etcd,elimisteve/etcd,joshix/etcd,fasaxc/etcd,hzy001/etcd,kkaneda/etcd,spotify/etcd,Yhgenomics/etcd,swingbach/etcd,dannysauer/etcd,pigfoot/etcd,rnaveiras/etcd,njharman/etcd,OyTao/etcd_learning,xebitstudios/etcd,rnaveiras/etcd,tangkun75/etcd,jravetch/etcd,honeyqa/etcd,Yhgenomics/etcd,handsomesun/etcd,iamqizhao/etcd,bluebreezecf/etcd,OyTao/etcd_learning,hongchaodeng/etcd,gae123/etcd,pauldallen/etcd,chai2010/etcd,njucslqq/etcd,cloudfoundry/etcd,tempbottle/etcd,xychu/etcd,gosharplite/etcd,yifan-gu/etcd,mwitkow/etcd,buaazp/etcd,bakins/etcd,philips/etcd,tamird/etcd,spotify/etcd,kingland/etcd,TheHippo/etcd,SivagnanamCiena/etcd,junxu/etcd,devfreesg/etcd,wowsoso/etcd,arthurcolle/etcd,es-chow/etcd,HideoYamauchi/etcd,etcd-io/etcd,QuantiumTechnology/etcd,spotify/etcd,chenbaihu/etcd,honeyqa/etcd,sofuture/etcd,jefby/etcd,li-ang/etcd,akauppi/etcd,youxidev/etcd,tamird/etcd,olark/etcd,cchamplin/etcd,betawaffle/etcd,jonboulle/etcd,ktateish/etcd,dnaeon/etcd,yyljlyy/etcd,oscarrr110/etcd,insequent/etcd,hroyrh/etcd,cchamplin/etcd,spacejam/etcd,ylong/etcd,beni55/etcd,nieanan/etcd,TheHippo/etcd,jmptrader/etcd,cockroachdb/etcd,vimalk78/etcd,rchicoli/etcd,qiaochao911/etcd,raoofm/etcd,barakmich/etcd,StorReduce/etcd,polvi/etcd,shawnps/etcd,ylong/etcd,svdata/etcd,yudai/etcd,luxas/etcd,heyitsanthony/etcd,westhood/etcd,nekto0n/etcd,yifan-gu/etcd,xueshanf/etcd,betawaffle/etcd