Brawlstats

Added
- Implemented an endpoint with `Client.get_event_rotation` which gets the events in the current rotation.
- Added a method `Player.get_battle_logs` which directly gets the player's battle log.
Fixed
- Client actually uses session passed into parameters now instead of creating a new one anyways
- `UnexpectedError` now properly shows the returned text in the message
- The `use_cache` parameter now works for `get_brawlers` and the async client
Removed
- Removed the prevent_ratelimit option for the Client
- Dropped support for Python 3.5, 3.6, 3.7, and 3.8
- Removed `Client.get_constants` as the site that was hosting it is no longer running

Fixed
- Installation dependency issue with aiohttp

Added
- `use_cache` parameter for methods to specify whether or not to use cache for a specific API call
Changed
- Wrapper no longer replaces the letter O with 0 for tags to better represent a valid tag

Changed
- Format of the string of `utils.get_datetime`
Fixed
- `Player.get_club` now works for the async client if the player is not in a club

Fixed
- Removed the print statement on client initialization
- Actually uses asyncio.Lock properly if the async client has the option `prevent_ratelimit=True`

Added
- `get_brawlers` function to get available brawlers
Changed
- Split `BaseBox` into `BaseBox` and `BaseBoxList` for convenience