contrib/raftexample: Update README to reflect dynamic configuration changes (fixes #4018)
contrib/raftexample: Update README to reflect dynamic configuration changes (fixes #4018)

endocode/etcd,fanminshi/etcd,jonboulle/etcd,heyitsanthony/etcd,swingbach/etcd,xiang90/etcd,ravigadde/etcd,akauppi/etcd,ravigadde/etcd,mqliang/etcd,mickep76/etcd,whuwxl/etcd,li-ang/etcd,achanda/etcd,coreos/etcd,rchicoli/etcd,insequent/etcd,sofuture/etcd,mqliang/etcd,qqsun8819/etcd,dannysauer/etcd,endocode/etcd,mkumatag/etcd,tguangch/etcd,heyitsanthony/etcd,purpleidea/etcd,plasticbox/etcd,handsomesun/etcd,gyuho/etcd,armstrongli/etcd,siddontang/etcd,ajityagaty/etcd,joshix/etcd,wantonsolutions/dinv-etcd,tguangch/etcd,plasticbox/etcd,armstrongli/etcd,qqsun8819/etcd,akauppi/etcd,mickep76/etcd,swingbach/etcd,visheshnp/etcd,luxas/etcd,jlamillan/etcd,vimalk78/etcd,chipironcin/etcd,hongchaodeng/etcd,wantonsolutions/dinv-etcd,xiang90/etcd,glevand/coreos--etcd,jonboulle/etcd,purpleidea/etcd,westhood/etcd,zaphod-concur/etcd,sebrandon1/etcd,a-robinson/etcd,CrazyJvm/etcd,glevand/coreos--etcd,ktateish/etcd,rchicoli/etcd,etcd-io/etcd,tamird/etcd,bdarnell/etcd,mqliang/etcd,insequent/etcd,yudai/etcd,joshix/etcd,li-ang/etcd,ajityagaty/etcd,jlamillan/etcd,chipironcin/etcd,rnaveiras/etcd,cockroachdb/etcd,dnaeon/etcd,StorReduce/etcd,cockroachdb/etcd,mkumatag/etcd,dnaeon/etcd,sinsharat/etcd,whuwxl/etcd,YuleiXiao/etcd,lorneli/etcd,sofuture/etcd,coreos/etcd,yudai/etcd,sinsharat/etcd,glycerine/etcd,visheshnp/etcd,a-robinson/etcd,achanda/etcd,glycerine/etcd,StorReduce/etcd,tamird/etcd,nekto0n/etcd,rnaveiras/etcd,etcd-io/etcd,mkumatag/etcd,sebrandon1/etcd,YuleiXiao/etcd,lumjjb/etcd,rnaveiras/etcd,fanminshi/etcd,bluebreezecf/etcd,OyTao/etcd_learning,gyuho/etcd,dannysauer/etcd,ktateish/etcd,lorneli/etcd,siddontang/etcd,hongchaodeng/etcd,wantonsolutions/dinv-etcd,etcd-io/etcd,lumjjb/etcd,westhood/etcd,bdarnell/etcd,zaphod-concur/etcd,vimalk78/etcd,bluebreezecf/etcd,luxas/etcd,linuxcer/etcd,nekto0n/etcd,OyTao/etcd_learning,ajityagaty/etcd,linuxcer/etcd,handsomesun/etcd,CrazyJvm/etcd