Changelog for 4.0.0-rc2
Changelog for 4.0.0-rc2

ZachGoldberg/asmack,chuangWu/asmack,Flowdalic/asmack,chuangWu/asmack,tks-dp/asmack,lovecc0923/asmack,Flowdalic/asmack,lizhangqu/asmack,tks-dp/asmack,lizhangqu/asmack,lovecc0923/asmack,ZachGoldberg/asmack