[Twisted-Python] Drop support for Python 3.3

[Adi Roiban]

On 18 December 2017 at 01:18, Craig Rodrigues <rodrigc at crodrigues.org> wrote:
> I submitted this patch to drop support for Python 3.3:
>
> https://github.com/twisted/twisted/pull/943
>
>
> 1.  Python 3.3 was declared EOL on Sep. 29, 2017
> 2.  In terms of major Linux distributions, Python 3.4 came with Python 3.4
> is in Debian 8, Ubuntu 14.04, Fedora 21
>
> So after this patch, Twisted would run on:
>
> Python 2.7 and Python 3.4+

+1  for removing python 3.3

But as commented in the PR, I would like to see this removed after the
next release, so that we don't have to change the release notes for
17.9.0
That is 18.X.X should be the last release to support 3.4

-- 
Adi Roiban