Add CHANGES file to chatops pack.
Add CHANGES file to chatops pack.

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