Windows documentation build failure

[Harmon758]

Long story short

Building the documentation fails on Windows

Expected behaviour

Successful documentation build

Actual behaviour

Attempts error with:

Configuration error:
There is a programable error in your configuration file:

Traceback (most recent call last):
  File "c:\program files\python36\lib\site-packages\sphinx\config.py", line 161, in __init__
    execfile_(filename, config)
  File "c:\program files\python36\lib\site-packages\sphinx\util\pycompat.py", line 150, in execfile_
    exec_(code, _globals)
  File "conf.py", line 31, in <module>
    fp.read(), re.M).groupdict()
AttributeError: 'NoneType' object has no attribute 'groupdict'

This is caused by usage of codecs.open, for which "no automatic conversion of '\n' is done on reading and writing." Therefore, "\r\n" is not converted to '\n', and the regex search fails with the carriage return and returns None.

Steps to reproduce

make doc
per https://docs.aiohttp.org/en/stable/contributing.html#documentation

Environment

Windows
Recommended Git line ending setting for Windows of "Checkout Windows-style, commit Unix-style", i.e. core.autocrlf set to true
Latest aiohttp cloned from repository

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[new issue]: https://github.com/aio-libs/aiohttp/issues/new