The py dependency in requirements.txt causes a security warning on
GitHub and attracts automated bug hunters (without the hunters verifying
the relevancy of the finding). Avoid this.
Flaws in py: CVE-2020-29651
Vulnerable versions: < 1.10.0
Patched version: 1.10.0
Description: A denial of service via regular expression in the py.path.svnwc
component of py (aka python-py) through 1.9.0 could be used by attackers to
cause a compute-time denial of service attack by supplying malicious input
to the blame functionality.
This fixes#40