Pacifica-notifications

Changed
- Pull 45 Remove Requirements pip>=20 by [dmlb2000](https://github.com/dmlb2000)

Changed
- Pull 43 `find()` Truthy Return by [dmlb2000](https://github.com/dmlb2000)

Added
- Pull 41 Add Python 3.7 and 3.8 by [dmlb2000](https://github.com/dmlb2000)
- Pull 40 Add Admin Event Retry by [dmlb2000](https://github.com/dmlb2000)
- Pull 39 Add Admin Event Get/Purge by [dmlb2000](https://github.com/dmlb2000)
- Fix 33 Add Event Logging by [dmlb2000](https://github.com/dmlb2000)

Changed
- Pull 36 Update Testing and PyLint 2.0+ by [dmlb2000](https://github.com/dmlb2000)
- Pull 35 Update Packaging URL by [dmlb2000](https://github.com/dmlb2000)
- Pull 31 Add Ansible Travis by [dmlb2000](https://github.com/dmlb2000)

Added
- Event subscription management API
- Event endpoint for notifying subscribers
- Model upgrade process
- ReadtheDocs supported Sphinx docs
- REST API for subscribing to events
- PUT - Update a Subscription
- POST - Create a Subscription
- GET - Get a Subscription
- DELETE - Delete a Subscription
- REST API for receiving events
- POST - receive new event

Changed