[Twisted-Python] Drop support for Python 3.4?

[Craig Rodrigues]

What do people think of dropping Twisted support for Python 3.4?

According to https://devguide.python.org/#status-of-python-branches

Python 3.4 EOL'd on March 19, 2019.

In the Python 3 world, we have Python 3.4, 3.5, 3.6, 3.7, and at
the end of this year we will have Python 3.8.

That's quite a lot of Python versions to support.

Python 3.5 introduced async/await keywords, which are very relevant to
Twisted:
https://docs.python.org/3.5/whatsnew/3.5.html#whatsnew-pep-492

If it makes sense, it would be nice to use these keywords as first-level
features in Twisted.

Since Amber brought up discussion of dropping Python 2.7 here:
https://twistedmatrix.com/pipermail/twisted-python/2019-March/032234.html

I thought I would raise dropping Python 3.4 also.
--
Craig
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