fix composition events in IE11
fix composition events in IE11

zOxta/vue,VictorChaun/vue,jhaesus/vue,meiwenhui/vue,bsn069/vue,cheapsteak/vue,AtChina/vue,seedalpha/vue,yuByte/vue,Alen-gao/vue,endaaman/vue,gold3bear/vue,th0r/vue,elvinzhu/vue,haner199401/vue,diermengdierme/vue,galenyuan/vue,JosephSilber/vue,coopsource/vue,lovewitty/vue,r14r/fork_javascript_vue,shupan123/vue-fixed-type,yuche/vue,meiwenhui/vue,ke-pan/vue,karevn/vue,WQuanfeng/vue,Erane/vue,bsn069/vue,galenyuan/vue,gxr1020/vue,lepture/vue,jhaesus/vue,fergaldoyle/vue,lazarofl/vue,cuhuak/vue,PUSEN/vue,shupan123/vue-fixed-type,shupan123/vue-fixed-type,endaaman/vue,r14r/fork_javascript_vue,jwdeitch/vue,ke-pan/vue,jRoadie/vue,Endika/vue,lovewitty/vue,squallyan/vue,kazupon/vue,lishengzxc/vue,VimVincent/vue,squallyan/vue,Zeratul5/vue,likaiwalkman/vue,JsAaron/vue,gold3bear/vue,lepture/vue,cheapsteak/vue,lazarofl/vue,Iamlars/vue,15521316173/vue,echoZQ/vue,AtChina/vue,wangjun/vue,zsh2938/vue,15521316173/vue,loki315zx/vue,prosenjit-itobuz/vue,Erane/vue,mubassirhayat/vue,Endika/vue,Suixinlei/vue,gxr1020/vue,KuroGuo/vue,nfriend/vue,yuByte/vue,GloriaCHL/vue,diermengdierme/vue,seedalpha/vue,longjl/vue,beni55/vue,cgvarela/vue,VimVincent/vue,th0r/vue,th0r/vue,zOxta/vue,echoZQ/vue,JosephSilber/vue,KuroGuo/vue,jwdeitch/vue,wangjun/vue,cgvarela/vue,Suixinlei/vue,cnbin/vue,loki315zx/vue,rohmad-st/vue,seedalpha/vue,longjl/vue,knownasilya/vue,jRoadie/vue,cnbin/vue,cuhuak/vue,diermengdierme/vue,nkovacs/vue,prosenjit-itobuz/vue,haner199401/vue,noyobo/vue,fergaldoyle/vue,zsh2938/vue,Jonavin/vue,galenyuan/vue,GloriaCHL/vue,macroxing/vue,Endika/vue,lepture/vue,coopsource/vue,meleslilijing/vue,Jonavin/vue,noyobo/vue,PUSEN/vue,kazupon/vue,nkovacs/vue,lishengzxc/vue,Zeratul5/vue,rohmad-st/vue,Iamlars/vue,elvinzhu/vue,karevn/vue,yuche/vue,fergaldoyle/vue,likaiwalkman/vue,macroxing/vue,meleslilijing/vue,beni55/vue,karevn/vue,knownasilya/vue,WQuanfeng/vue,VictorChaun/vue,JsAaron/vue,Alen-gao/vue