v0.5.9

This is a maintenance release fixing a number of bugs with a few miscellaneous
internal changes.

Thanks to the following for their contributions:

• @acdenisSK
• @Lakelezz
• @Mishio595
• @perryprog
• @Roughsketch
• @zeyla

Upgrade Path

There are no deprecations or breaking changes.

Added

• [model] Add session start info in BotGateway (@zeyla) c:12bbc1a
• [model] Add Member::user_id (@zeyla) c:669da40
• [framework] Suggest similar commands when using help (@Lakelezz) c:ce79f01
• [framework] add single group help (@Lakelezz) c:75f6516

Fixed

• [http] Fix routing for http::create_private_channel (regression from 0.5.6)
  (@zeyla) c:30a325e
• [http] Fix GuildChannel::_permissions_for on no-cache builds (regression
  from 0.5.8) (@zeyla) c:e59f766
• [http] Change HTTP bulk delete from DELETE to POST (regression from 0.5.6)
  (@Mishio595) c:ebbc324
• [framework] Make is_command_visible work with DMs (@Roughsketch)
  c:7295079
• [utils] Add newline in MessageBuilder::push_codeblock_safe (@zeyla)
  c:e66812a
• [framework] Fix has_correct_permissions when no guild is available
  (@Lakelezz) c:19c65bd
• [framework] Check if bots are ignored before dispatching
  unrecognised_command (@Lakelezz) c:966cb3e
• [framework] Fix group prefix ambiguity in help (@Lakelezz) c:f01e6e3,
  c:c49e02c
• [framework] Add missing usage on plain help (@Lakelezz) c:823b829
• [framework] Add usage sample back to help (@Lakelezz) c:82dbff2
• [framework] Check if group is empty and exclude if so (@Lakelezz)
  c:4778e69
• [model] Message: avoid permission checks in non-guild channels (@zeyla)
  c:3fbab76

Misc.

• [docs] Fix a broken link in README (@Mishio595) c:41b6e24
• [docs] Properly link to User in Game docs (@zeyla) c:dec3f13
• [http] Move low-level http functions to http::raw and re-export (@zeyla)
  c:6157f61
• [utils] Add more unit tests for MessageBuilder (@zeyla) c:14c6099
• [framework] Refactor help (@Lakelezz) c:28cdc53
• [docs] Update client docs to not say user token (@perryprog) c:6ca4bea
• [framework] Add tests for help (@Lakelezz) c:79d8843
• [model] Remove cache requirement on Message::is_private (@zeyla)
  c:fe69ef0