README update
README update

dusunboy/snackbar,open-keychain/snackbar,nispok/snackbar,JohnTsaiAndroid/snackbar,Altaf-Mahdi/android_external_android-snackbar,hukumsingh87/snackbar,chengkaizone/snackbar,zh-kevin/snackbar,AICP/external_android-snackbar,vvallabb/snackbar