bump version to 0.4.0
bump version to 0.4.0

cloudrain21/ardb,bssrdf/ardb,spitfire2/ardb,lsm/ardb,wfxiang08/ardb,cloudrain21/ardb,yinqiwen/ardb,bssrdf/ardb,lsm/ardb,spitfire2/ardb,placrosse/ardb,yinqiwen/ardb,wfxiang08/ardb,tempbottle/ardb,tempbottle/ardb,placrosse/ardb