* master: (107 commits)
  bpo-22057: Clarify eval() documentation (GH-8812)
  bpo-34318: Convert deprecation warnings to errors in assertRaises() etc. (GH-8623)
  bpo-22602: Raise an exception in the UTF-7 decoder for ill-formed sequences starting with "+". (GH-8741)
  bpo-34415: Updated logging.Formatter docstring. (GH-8811)
  bpo-34432: doc Mention complex and decimal.Decimal on str.format not about locales (GH-8808)
  bpo-34381: refer to 'Running & Writing Tests' in README.rst (GH-8797)
  Improve error message when mock.assert_has_calls fails (GH-8205)
  Warn not to set SIGPIPE to SIG_DFL (#6773)
  bpo-34419: selectmodule.c does not compile on HP-UX due to bpo-31938 (GH-8796)
  bpo-34418: Fix HTTPErrorProcessor documentation (GH-8793)
  bpo-34391: Fix ftplib test for TLS 1.3 (GH-8787)
  bpo-34217: Use lowercase for windows headers (GH-8472)
  bpo-34395: Fix memory leaks caused by incautious usage of PyMem_Resize(). (GH-8756)
  bpo-34405: Updated to OpenSSL 1.1.0i for Windows builds. (GH-8775)
  bpo-34384: Fix os.readlink() on Windows (GH-8740)
  closes bpo-34400: Fix undefined behavior in parsetok(). (GH-4439)
  bpo-34399: 2048 bits RSA keys and DH params (#8762)
  Make regular expressions in test_tasks.py raw strings. (GH-8759)
  smtplib documentation fixes (GH-8708)
  Fix misindented yaml in logging how to example (GH-8604)
  ...