Python 2.x support statement

[jd-boyd]

I'll put this in the readme when finalized.

I get the impression that a lot of users of this package still are on 2.7. comments for or against that idea would be nice.

I'm thinking that python 2.7 support will be maintained up until the 2020 deadline. I would really like to get a roll up release done before them that fixes all known packaging issues on Windows and macos.

After python 2.7 hits end of life, a python 2.7 support branch will be made an python 2.7 will eventually be dropped from master.

Until then, python 2.6 support will probably also remain as long as it continues to be no more burden than 2.7 itself already is.