v0.5.8

Thanks to the following for their contributions:

• @acdenisSK
• @Erk-
• @Lakelezz
• @Lymia
• @Mishio595
• @zeyla

Upgrade Path

Per c:71edc3a, methods on ID structs like ChannelId::find have been
deprecated and replace with UserId::to_channel_cached. Similarly, methods like
GuildId::get have been replaced with GuildId::to_partial_guild. While the
original methods have not been removed, they have been deprecated.

Added

• [utils] Add Colour::hex (@Mishio595) c:8bec4af

Fixed

• [http] Fix various incorrect routes (@Lymia) c:826220f
• [docs] Fix all the dead links in the docs (@Erk-) c:40053a7
• [voice] Stop attempting to send silent frames (reverts a commit) (@zeyla)
  c:0bbe5f5

Changed

• [model] Add to_*, as_* methods on Id types, deprecate get and find
  methods (@Lakelezz) c:71edc3a

Misc.

• [framework] Fix doctest for Args::iter_quoted (@acdenisSK) c:7b0cff6
• [framework] Remove some code duplication (@Lakelezz) c:516ede3
• [framework] Don't trim command on failure in default command (@Lakelezz)
  c:46b4194