[Checkins] [zopefoundation/Products.StandardCacheManagers] 317700: Restore `diff` flag as requested

[Jürgen Gmach]

  Branch: refs/heads/fix-build
  Home:   https://github.com/zopefoundation/Products.StandardCacheManagers
  Commit: 3177006f0fc7719f5f213390740b5a9d80494aeb
      https://github.com/zopefoundation/Products.StandardCacheManagers/commit/3177006f0fc7719f5f213390740b5a9d80494aeb
  Author: Jürgen Gmach <juergen.gmach at googlemail.com>
  Date:   2020-10-08 (Thu, 08 Oct 2020)

  Changed paths:
    M tox.ini

  Log Message:
  -----------
  Restore `diff` flag as requested

modified:   tox.ini