supprot android studio 3.0

feat(sample): set digestalg parameter in sample app

chore(build): upgrade verstion to 1.2.6 in readme

prepare release 1.2.5

feat(sample): add how to use finalApkBackupPath property in example

ref shwenzhang#187

Release 1.2.3

Release 1.2.2

Release 1.2.1

Release 1.2.0

Release 1.1.16