[Biopython-dev] Updating Biopython requirements wording to recommend Python 3

[Peter Cock]

Hello all,

Currently our README file says:

We currently recommend using Python 2.7 from http://www.python.org which
is the final version of Python 2.  Early adopters are encouraged to try
Biopython under Python 3.3, 3.4, or 3.5 but not all the optional dependencies
are available yet.

Would anyone object to a more forward looking phrasing, e.g.

We currently recommend using Python 3.5 from http://www.python.org and avoiding
legacy Python 2.6 or 2.7 unless your choice is restricted due to having to work
with old code.

Peter