Update sha_constructor to hashlib.sha256
Update sha_constructor to hashlib.sha256

pinax/symposion,euroscipy/symposion,toulibre/symposion,pydata/symposion,euroscipy/symposion,pyohio/symposion,miurahr/symposion,pyohio/symposion,pinax/symposion,pyconau2017/symposion,faulteh/symposion,pyconau2017/symposion,toulibre/symposion,pydata/symposion,miurahr/symposion,faulteh/symposion