[Checkins] [zopefoundation/groktoolkit] 25551f: update martian version pin

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/zopefoundation/groktoolkit
  Commit: 25551f7710de8c9bbc20b52f2618176dd5c57b45
      https://github.com/zopefoundation/groktoolkit/commit/25551f7710de8c9bbc20b52f2618176dd5c57b45
  Author: Jan-Wijbrand Kolman <jkolman at minddistrict.com>
  Date:   2018-01-25 (Thu, 25 Jan 2018)

  Changed paths:
    M grok.cfg

  Log Message:
  -----------
  update martian version pin