Bug fix: Restore MacOS compatibility after release 9.3
Bug fix: Restore MacOS compatibility after release 9.3

The following build failure became apparent to me just minutes after
publishing release 9.3 so I decided to change the implementation:
https://travis-ci.org/xolox/python-coloredlogs/jobs/372806733

xolox/python-coloredlogs,xolox/python-coloredlogs