sarge is incompatible with Python 3.7
c.f. https://bitbucket.org/vinay.sajip/sarge/issues/38/python-37-breakage
We should probably switch to the widely used https://pypi.org/project/sh/
c.f. https://bitbucket.org/vinay.sajip/sarge/issues/38/python-37-breakage
We should probably switch to the widely used https://pypi.org/project/sh/