v0.8.2

This is a release for a critical bugfix.
In an attempt to fix one thing, other things broke. Any time Serenity made a request to a POST or PUT endpoint (such as creating reactions or banning users), Discord would return HTTP 400. This release corrects that.

Thanks to the following for their contributions:

• @Lakelezz

Fixed

• [http] Always send the Content-Length header (@Lakelezz) c:f5dd8bf