this release finishes the usage.md page on the documentation, makes specifying a `user_agent` mandatory when instantiating a `FloweryAPIConfig` class, and fixes a bug that would prevent the `FloweryAPI` class from being instantiated inside of an async event loop
added automatic retry handlers for 429 and 5xx error codes, as well as custom exceptions for ratelimiting, client errors, and server errors
also added a more advanced user agent string constructor. previously, setting FloweryAPIConfig.user_agent would override the default user_agent. so, if you set user_agent to `foobar`, the user agent string would be `foobar` in requests. now, the user agent string sent by requests would be the following on my development machine:
`'User-Agent': 'PyFlowery/1.0.3 PyFloweryTests (Python 3.12.6 (main, Sep 8 2024, 13:18:56) [GCC 14.2.1 20240805])'`
