Psnawp

- Removed the client side checking of psnid since it was cause some trouble
- Added str and repr for Group

Fixed the broken endpoint for profile_url

Added python 3.8 support. Sorry for the two releases in one day.

- When access_token is obtained though refresh token, I forgot to add theaccess_token_expires_at. Which leads to a key error later.
- Improves the docstring for some methods
- Improves the docstring and added some missing type hints.

**Warning: This version breaks the backward compatibility from the previous versions.**

It has been a while since the last update. I figured maybe I should update the API since there has been some development, thanks to kerdion.

Also, I thought I should make this project a bit more proper, like having CI, test, and documentation. The versioning system is changed from cal version to sem version because I thought it conveys important formation more efficiently, Besides, I didn't use the Cal version correctly, to begin with.

Here is a list of what's changed

- Fixed Group Messaging
- Fixed Search System
- Added CI, Documentation, and Tests
- Made import slightly less awkward
- Fixed the issue where the access_token was fetched on every request instead of using the old one

Future plans:
- Add Trophy support
- Add more endpoints to already existing classes
- Get closer to 100% code coverage

If there are issues with PyPi, let me know, and I'll try to fix them. For now, I have yanked the old versions, but I will remove them in the future.