update readme
update readme

tochange/richeditor-android,msandroid/richeditor-android,tochange/richeditor-android,andforce/richeditor-android,tieusangaka/richeditor-android,wasabeef/richeditor-android,leixinstar/richeditor-android,WilliamRen/richeditor-android,0359xiaodong/richeditor-android,weikipeng/richeditor-android,tsdl2013/richeditor-android,prashant31191/richeditor-android,tsdl2013/richeditor-android,leixinstar/richeditor-android,changjiashuai/richeditor-android,andforce/richeditor-android,0359xiaodong/richeditor-android,andforce/richeditor-android,chenglei1986/richeditor-android,onlynight/richeditor-android,wasabeef/richeditor-android,tieusangaka/richeditor-android,moukail/richeditor-android,prashant31191/richeditor-android,tochange/richeditor-android,tieusangaka/richeditor-android,moukail/richeditor-android,msandroid/richeditor-android,onlynight/richeditor-android,weikipeng/richeditor-android,tsdl2013/richeditor-android,wasabeef/richeditor-android,leixinstar/richeditor-android,WilliamRen/richeditor-android,0359xiaodong/richeditor-android,changjiashuai/richeditor-android,chenglei1986/richeditor-android,msandroid/richeditor-android,chenglei1986/richeditor-android,moukail/richeditor-android,prashant31191/richeditor-android,changjiashuai/richeditor-android,onlynight/richeditor-android,weikipeng/richeditor-android,WilliamRen/richeditor-android