Update contributing documentation
Update contributing documentation

sheldonzf/seajs,zwh6611/seajs,JeffLi1993/seajs,FrankElean/SeaJS,seajs/seajs,yern/seajs,twoubt/seajs,seajs/seajs,wenber/seajs,eleanors/SeaJS,mosoft521/seajs,AlvinWei1024/seajs,baiduoduo/seajs,LzhElite/seajs,ysxlinux/seajs,baiduoduo/seajs,coolyhx/seajs,lovelykobe/seajs,AlvinWei1024/seajs,liupeng110112/seajs,tonny-zhang/seajs,kaijiemo/seajs,uestcNaldo/seajs,jishichang/seajs,imcys/seajs,sheldonzf/seajs,jishichang/seajs,longze/seajs,zaoli/seajs,Lyfme/seajs,zaoli/seajs,evilemon/seajs,ysxlinux/seajs,treejames/seajs,yuhualingfeng/seajs,lianggaolin/seajs,zwh6611/seajs,treejames/seajs,liupeng110112/seajs,moccen/seajs,MrZhengliang/seajs,judastree/seajs,ysxlinux/seajs,lianggaolin/seajs,13693100472/seajs,JeffLi1993/seajs,uestcNaldo/seajs,wenber/seajs,yuhualingfeng/seajs,coolyhx/seajs,MrZhengliang/seajs,judastree/seajs,Gatsbyy/seajs,mosoft521/seajs,JeffLi1993/seajs,treejames/seajs,moccen/seajs,wenber/seajs,lee-my/seajs,miusuncle/seajs,judastree/seajs,lianggaolin/seajs,Gatsbyy/seajs,twoubt/seajs,liupeng110112/seajs,miusuncle/seajs,longze/seajs,miusuncle/seajs,LzhElite/seajs,kuier/seajs,angelLYK/seajs,Gatsbyy/seajs,eleanors/SeaJS,chinakids/seajs,chinakids/seajs,FrankElean/SeaJS,13693100472/seajs,PUSEN/seajs,imcys/seajs,Lyfme/seajs,mosoft521/seajs,tonny-zhang/seajs,kuier/seajs,lee-my/seajs,yern/seajs,kuier/seajs,hbdrawn/seajs,lee-my/seajs,moccen/seajs,evilemon/seajs,lovelykobe/seajs,angelLYK/seajs,FrankElean/SeaJS,evilemon/seajs,hbdrawn/seajs,LzhElite/seajs,zaoli/seajs,sheldonzf/seajs,AlvinWei1024/seajs,tonny-zhang/seajs,eleanors/SeaJS,coolyhx/seajs,uestcNaldo/seajs,yuhualingfeng/seajs,longze/seajs,kaijiemo/seajs,121595113/seajs,lovelykobe/seajs,kaijiemo/seajs,twoubt/seajs,imcys/seajs,Lyfme/seajs,PUSEN/seajs,PUSEN/seajs,zwh6611/seajs,121595113/seajs,jishichang/seajs,MrZhengliang/seajs,seajs/seajs,angelLYK/seajs,yern/seajs,baiduoduo/seajs