[Checkins] [zopefoundation/Zope] 8cc982: use a constraints file for virtualenv install

[GitHub]

  Branch: refs/heads/pip_install_use_constraints
  Home:   https://github.com/zopefoundation/Zope
  Commit: 8cc982f76dd1135b83e0e725e716a36d068df82a
      https://github.com/zopefoundation/Zope/commit/8cc982f76dd1135b83e0e725e716a36d068df82a
  Author: tschorr <t_schorr at gmx.de>
  Date:   2018-10-04 (Thu, 04 Oct 2018)

  Changed paths:
    M constraints.txt
    M docs/INSTALL-virtualenv.rst
    M util.py

  Log Message:
  -----------
  use a constraints file for virtualenv install



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