[Twisted-Python] Python 3 support in Twisted: Request for relaxation of coverage requirements

[Itamar Turner-Trauring]

>  That said, there are
> syntax changes ('except...as...' being the big one) that make supporting
> 2.5->3 difficult, and only becomes reasonable at 2.6->3.  So it may be
> necessary to get 2to3 involved for some fixers.

We've dropped support for 2.6 post-12.1. So that's not a problem. We can
do these changes now in trunk.