[Checkins] [zopefoundation/zope.component] e12254: Add Python 3.8, drop 3.4

[Marius Gedminas]

  Branch: refs/heads/py38
  Home:   https://github.com/zopefoundation/zope.component
  Commit: e1225435173221d1ae17dd5290fb6fec86e6d233
      https://github.com/zopefoundation/zope.component/commit/e1225435173221d1ae17dd5290fb6fec86e6d233
  Author: Marius Gedminas <marius at gedmin.as>
  Date:   2019-11-12 (Tue, 12 Nov 2019)

  Changed paths:
    M .travis.yml
    M CHANGES.rst
    M setup.py
    M tox.ini

  Log Message:
  -----------
  Add Python 3.8, drop 3.4

Restore MINIMAL=1 test builds on Travis, disabled by accident due to
YAML having the same key (matrix) defined twice at top level.