New features:
- A canvas renderer has been merged, improving performance by a lot
  (34a7ca8)
- It is now possible to edit the HTML of contenteditable elements
  (6ed8dfd)

Bug fixes:
- Firenvim now works better with frames (8e6895e)
- Firenvim won't focus the editor if it is closed while the page is
  focused (934f772)
- Firenvim will now work better with pages that remove its elements from
  the page (b6003c6)
- Firenvim will now respect XDG on Linux (44113e4)