2017-10-23-19-45-52.bpo-30722.ioRlAu.rst

Make redemo work with Python 3.6 and newer versions.

In Python 3.6, flags like re.DOTALL became members of an enum.IntFlag so usages like getattr(re, 'DOTALL') are invalid.

Also, remove the LOCALE option since it doesn't work with string patterns in Python 3.