branchcache: store filtered hash and obsolete hash independently for V3
This will avoid the bug covered in tests/test-branches-obsolete.t when we stop
storing all heads explicitly in V3.
# black pulls in typed-ast, which doesn't install on PyPy.
black==19.10b0 ; python_version >= '3.6' and platform_python_implementation != 'PyPy'
# Bazaar doesn't work with Python 3 nor PyPy.
bzr ; python_version <= '2.7' and platform_python_implementation == 'CPython'
docutils
fuzzywuzzy
# isort 5.0 drops support for Python 3.5. We can remove this line when we
# drop support for 3.5.
isort < 5.0
pyflakes
pygments
pylint
# Needed to avoid warnings from fuzzywuzzy.
python-Levenshtein
# typed-ast dependency doesn't install on PyPy.
typed-ast ; python_version >= '3.0' and platform_python_implementation != 'PyPy'
vcrpy