Log Message:
chat/gomuks: update to 0.3.0

 - Bumped minimum Go version to 1.18.
 - Switched from /r0 to /v3 paths everywhere.
    - The new v3 paths are implemented since Synapse 1.48, Dendrite 0.6.5, and
      Conduit 0.4.0. Servers older than these are no longer supported.
 - Added config flags for backspace behavior.
 - Added /rainbownotice command to send a rainbow as a m.notice message.
 - Added support for editing messages in an external editor.
 - Added arrow key support for navigating results in fuzzy search.
 - Added initial support for configurable keyboard shortcuts (thanks to @3nprob
   in #328).
 - Added support for shortcodes without tab-completion in /react (thanks to
   @tleb in #354).
 - Added background color to differentiate inline code (thanks to @n-peugnet
   in #361).
 - Added tab-completion support for /toggle options (thanks to @n-peugnet in
   #362).
 - Added initial support for rendering spoilers in messages.
 - Added support for sending spoilers (with ||reason|spoiler|| or ||spoiler||).
 - Added support for inline links (limited terminal support; requires /toggle
   inlineurls).
 - Added graphical file picker for /upload when no path is provided (requires
   zenity).
 - Updated more places to use default/reverse colors instead of white/black to
   better work on light themed terminals (thanks to @n-peugnet in #401).
 - Fixed mentions being lost when editing messages.
 - Fixed date change messages showing the wrong date.
 - Fixed some whitespace in HTML being rendered even when it shouldn't.
 - Fixed copying non-text messages with /copy.
 - Fixed rendering code blocks with unknown languages (thanks to @n-peugnet in
   #386).
 - Fixed newlines not working in code blocks with certain syntax highlightings
   (thanks to @n-peugnet in #387).
 - Fixed rendering more than one reaction of the same type in a single message
   (thanks to @n-peugnet in #391).
 - Fixed line-wrapped messages getting corrupted when receiving a reaction
   (thanks to @n-peugnet in #397).