Update changelog info for release - 3.4.0
Update changelog info for release - 3.4.0

Plexxi/st2,StackStorm/st2,StackStorm/st2,StackStorm/st2,nzlosh/st2,nzlosh/st2,Plexxi/st2,Plexxi/st2,Plexxi/st2,nzlosh/st2,StackStorm/st2,nzlosh/st2