hg-core: silence dead-code warning by adding RevlogEntry::revion() accessor
Nightly `rustc` warns about the `RevlogEntry::rev` field not being
used. Rather than removing it, I added an accessor since it seems
useful to be able to get the entry's revision.
Differential Revision: https://phab.mercurial-scm.org/D11548
[build-system]
requires = ["setuptools", "wheel"]
[tool.black]
line-length = 80
exclude = '''
build/
| wheelhouse/
| dist/
| packages/
| \.hg/
| \.mypy_cache/
| \.venv/
| mercurial/thirdparty/
'''
skip-string-normalization = true
quiet = true