download support libs for travis
download support libs for travis

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