[Checkins] [zopefoundation/persistent] 86b311: Use Python 3.6.2 on Mac OS

[Marius Gedminas]

  Branch: refs/heads/macpython-3.6
  Home:   https://github.com/zopefoundation/persistent
  Commit: 86b3113fa908af5002441f5c2b6ea3e372d99369
      https://github.com/zopefoundation/persistent/commit/86b3113fa908af5002441f5c2b6ea3e372d99369
  Author: Marius Gedminas <marius at gedmin.as>
  Date:   2020-01-17 (Fri, 17 Jan 2020)

  Changed paths:
    M .travis.yml

  Log Message:
  -----------
  Use Python 3.6.2 on Mac OS

3.6.1 broke ABI, 3.6.2 fixed it.  More details at
https://bugs.python.org/issue29943.