* Drop Python 2 Support
  * Drop support for Django < 2.2
  * Add support for Django 2.2, 3.0, 3.1, and 3.2
  * Drop support for Python < 3.6
  * Add Support for Python 3.6, 3.7, 3.8, and 3.9
  * Move travis-ci testing to gitlab
  * Remove Support for EncryptedNullBooleanField (deprecated by Django 4.0)
  * Update Test App to Django 2.2 standard