CHANGELOG-3.4: move "Tooling" above
CHANGELOG-3.4: move "Tooling" above

Signed-off-by: Gyuho Lee <3454051ee3341eb69bdf6fca40899cdad4d86496@gmail.com>

mkumatag/etcd,mqliang/etcd,gyuho/etcd,vimalk78/etcd,dannysauer/etcd,sebrandon1/etcd,ajityagaty/etcd,cockroachdb/etcd,glevand/coreos--etcd,rnaveiras/etcd,mkumatag/etcd,joshix/etcd,gyuho/etcd,bdarnell/etcd,vimalk78/etcd,cockroachdb/etcd,ajityagaty/etcd,coreos/etcd,etcd-io/etcd,mqliang/etcd,joshix/etcd,mkumatag/etcd,sinsharat/etcd,bdarnell/etcd,rnaveiras/etcd,ajityagaty/etcd,sebrandon1/etcd,etcd-io/etcd,rnaveiras/etcd,li-ang/etcd,li-ang/etcd,glevand/coreos--etcd,dannysauer/etcd,coreos/etcd,xiang90/etcd,etcd-io/etcd,mqliang/etcd,xiang90/etcd,sinsharat/etcd