New features:
- Error messages from neovim should be easier to understand (233ce64)
- Firenvim now works with a windows browser and a wsl neovim (53229b4)
- Firenvim now works with microsoft edge on windows (aa8b834)
- Firenvim now works with chrome-dev/unstable on linux (2f7ed74)
- A ton of new tests that should bring much more stability to Firenvim

Bug fixes:
- Mouse coordinates used to be wrong when the browser was zoomed-in (696b978)
- <C-MouseLeft> now works
- Sending multiple events from neovim (e.g. write and focus_page) to
  firenvim used to result in race conditions, now fixed (e00e2f6)
- Setting the cursor position on firenvim writes now works on Chrome (bf549e0)
- There used to be a race condition where Firenvim would start before
  the content of the textarea was written to the disk, now fixed (801039d)
- Browser shortcuts would sometimes be duplicated (c4be634)
- The "Toggle firenvim in this tab" button did not always work when
  trying to re-enable firenvim (5182bb6)

Feature removal:
- Browser shortcuts for focusPage/focusInput have been removed. They
  have been broken for a while a nobody complained. Use
  firenvim#focus_page() and firenvim#focus_input() instead (aaccf84)