[Twisted-Python] Twisted 21.2.0 Release Announcement

[Craig Rodrigues]

On behalf of Twisted Matrix Laboratories, I am honored to announce the
release of Twisted 21.2.0!

There are two major announcements for this release:

- *Python 2.7 support has been dropped*.  Twisted 21.2.0 supports Python
3.5.3 and higher only
- *This will be the last Twisted release to support Python 3.5*.

Twisted 21.2.0 brings the following:
- twist dns --pyzone now works on Python 3
- twisted.web.twcgi now works on Python 3
- all tests pass on all platforms on Python 3.8, including asyncio tests on
Windows
- tests pass on Python 3.9 (thanks to Michał Górny)
- type hints, as specified in PEP 484, are now used in functions throughout
the codebase
- mypy (static type checker) is now run over the codebase during CI to help
detect problems, and help improve the use of types
- code in is now formatted with Black (thanks to Tom Most)
- many CI and automation improvements (thanks to Adi Roiban and Thomas
Grainger)
- many more fixes (225 tickets closed!)


You can install by running this command:

      python -m pip install Twisted==21.2.0

The full tarball is available at:
    https://pypi.org/project/Twisted/21.2.0/#files

The full NEWS file with all changes is at:
    https://github.com/twisted/twisted/blob/twisted-21.2.0/NEWS.rst
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