README: fix formatting on hangouts link
README: fix formatting on hangouts link

Added link and removed wrongly copied text
ajityagaty/etcd,dannysauer/etcd,rnaveiras/etcd,etcd-io/etcd,dannysauer/etcd,cockroachdb/etcd,rnaveiras/etcd,mqliang/etcd,li-ang/etcd,ajityagaty/etcd,cockroachdb/etcd,mkumatag/etcd,rnaveiras/etcd,li-ang/etcd,gyuho/etcd,mkumatag/etcd,etcd-io/etcd,mkumatag/etcd,mqliang/etcd,coreos/etcd,etcd-io/etcd,coreos/etcd,gyuho/etcd,ajityagaty/etcd,mqliang/etcd