Version 0.4.1

* Added the ability to disable notifications using `!su notify stop`
* Remove reply fallback text from messages before adding to the post
* Improvements to thread UX
* Added a `space.nevarro.msc3464.on_behalf_of` key to the content indicating who
  the standup post is for.
* Fixed bug where the standupbot would leave because it thought it was the last
  in the room.
* Internal Changes
  * Migrated from sourcehut to GitLab
  * Added pre-commit config
  * Use `format.RenderMarkdown` from mautrix instead of manually rendering
    markdown and HTML versions of all of the messages.