linelog: suppress annoying pytype warning about an ignored metaclass
This isn't actively hurting us right now, and it's not trivial to set
up this metaclass correctly on both Python 2 and Python 3 without
dragging in all of `six`, but we still get lots of typechecking
goodness with this error suppressed.
Differential Revision: https://phab.mercurial-scm.org/D7270
[tool.black]
line-length = 80
exclude = '''
build/
| wheelhouse/
| dist/
| packages/
| \.hg/
| \.mypy_cache/
| \.venv/
| mercurial/thirdparty/
| contrib/python-zstandard/
'''
skip-string-normalization = true
quiet = true