[Checkins] [zopefoundation/ZODB] 7138f4: Fix wrong type in MVCC test

[Julien Muchembled]

  Branch: refs/heads/issue290
  Home:   https://github.com/zopefoundation/ZODB
  Commit: 7138f4d2dd6bdf18081396c8c9ecb74a3b41bd76
      https://github.com/zopefoundation/ZODB/commit/7138f4d2dd6bdf18081396c8c9ecb74a3b41bd76
  Author: Julien Muchembled <jm at nexedi.com>
  Date:   2020-06-02 (Tue, 02 Jun 2020)

  Changed paths:
    M src/ZODB/tests/testmvcc.py

  Log Message:
  -----------
  Fix wrong type in MVCC test