Changed
- Pull 48 Add Python 3.7 and 3.8 testing by [dmlb2000](https://github.com/dmlb2000)
- Pull 47 Update Pylint 2.0+ by [dmlb2000](https://github.com/dmlb2000)
- Pull 46 Use Bionic in Travis CI by [dmlb2000](https://github.com/dmlb2000)
- Pull 45 Remove Python 2.7 support by [dmlb2000](https://github.com/dmlb2000)