New Features
* Upgrade to Python 3.9+
* Update type annotations
* `Submission` parses next and previous submission IDs
* `FAAPI.watchlist_by()` and `FAAPI.watchlist_to()` methods support multiple watchlist pages
Changes
* Renamed `FAAPI.get_parse` to `get_parsed`
* Removed _get_ prefix from `FAAPI` methods (e.g. `get_submission` to `submission`) and return a list of `UserPartials`
objects instead of `Users`
* Added `__all__` declarations to allow importing exceptions and secondary functions from `connection` and `parse`
* `datetime` fields are not serialised on `__iter__` (e.g. when casting a `Submission` object to `dict`)