updates README
updates README

zhaochuanTeam/Crouton,jferlisi/Crouton,java02014/Crouton,remind101/Crouton,pengleelove/Crouton,yummy222/Crouton,wangwangheng/Crouton,xu33liang33/Crouton,loulousky/Crouton,chwnFlyPig/Crouton,kzganesan/Crouton,hongnguyenpro/Crouton,mikepenz/Crouton,Brooks0129/Crouton,simple88/Crouton,keyboardsurfer/Crouton,hejunbinlan/Crouton,hgl888/Crouton,zllbird/Crouton