Mokkari

Changes since last release:
- Use ' display_name' instead '__str__' for series list name results.

Changes since last release:
- Use correct version in user-agent string. Fixes 1
- Added connection error handling to api request.
- **API Change** changed IssueSchema 'name' field to 'story_titles'
- **API Change** added 'issue_name' field to IssueSchema
- **API Change** changed SeriesSchema 'publisher' field to 'publisher_id'
- Documentation improvements

Changes since last release:
- Add __getitem__ to list classes.
- Add some type hinting to code.

Changes since last release:
- Fixed name of session.py
- Modified some test to mock requests.

Changes since last release:
- Add support to use a sqlite cache of API requests.
- Initial work on documentation which can be found at: https://mokkari.readthedocs.io/en/latest/
- Fixed Issue schema for store_date being 'None'.

Changes since last release:
- None. Released to hopefully fix the pypi github action.