Refactor `HttpBuilder` to avoid `unwrap` calls (#1727)
Refactor `HttpBuilder` to avoid `unwrap` calls (#1727)

This refactors the HTTP builder to hold `ratelimiter_disabled` and `token`
without `Option`s, removing the need to use `unwrap` in the `build` method.
acdenisSK/serenity,Flat/serenity