Release Notes:
- vim: Added `:diff` and `:revert` (that work with `'<,'>`) to open the
selected diff and revert it.
- vim: Added `d o` to open the diff and `d p` to revert (spiritually
similar to vim's do/dp, though obviously not the same)
- vim: Added `ctrl-p` and `ctrl-n` to summon the autocomplete menu in
insert mode.