py3: account for extra line break in email headers in test-notify.t
Long headers appears to be wrapped with new lines. In test-notify.t, we
have a "filter.py" that replaces "\n" by " ", so we get an extra space
in a Message-Id with a long value.
[tool.black]
line-length = 80
exclude = '''
build/
| wheelhouse/
| dist/
| packages/
| \.hg/
| \.mypy_cache/
| \.venv/
| mercurial/thirdparty/
| hgext/fsmonitor/pywatchman/
| contrib/python-zstandard/
| contrib/grey.py
'''
skip-string-normalization = true
quiet = true