[Checkins] [zopefoundation/BTrees] f80339: Drop Python 3.3 and add Python 3.7. Fixes #81.

[GitHub]

  Branch: refs/heads/issue81
  Home:   https://github.com/zopefoundation/BTrees
  Commit: f80339f366a2c2aef2e2b565ade671c042f3a7de
      https://github.com/zopefoundation/BTrees/commit/f80339f366a2c2aef2e2b565ade671c042f3a7de
  Author: Jason Madden <jamadden at gmail.com>
  Date:   2018-03-09 (Fri, 09 Mar 2018)

  Changed paths:
    M .manylinux-install.sh
    M .travis.yml
    M CHANGES.rst
    M appveyor.yml
    M setup.py
    M tox.ini

  Log Message:
  -----------
  Drop Python 3.3 and add Python 3.7. Fixes #81.