Fastapi-auth-utils

- README.md: Examples' link fixed for pypi.
- Package's `__init__.py`: `__version__` added.

- README.md: Installation instructions added.

Added:
- auth_required(): `user_class` parameter added which ensures the authenticated user is an instance of given type.
- Mixed auth example implemented.

Added:
- `APIKeyAuthBackend` and `AuthBackendsWrapper` auth backends implemented.
- APIKey authentication example added.

Modified:
- JWTAuthBackend: `get_user` option added for handling more complex authentication.
- `auth_required()`'s default security dependency removed.

Breaking changes:
- `auth_required()` will not enable swagger's authorize button by itself anymore. You can set security dependencies as app/router dependencies instead.