Log Message:
todotxt: Update to 2.12.0

Changes:
2.12.0
------
### Added
 - Added default priority variable `TODOTXT_PRIORITY_ON_ADD` ([#246])
 - Added `done` option as alias of `do` ([#169])
 - Added macOS 10.15.x support ([#300])
 - Highlighting of dates, metadata and item numbers ([#264])
 - Minimal config file / default filenames (todo.txt, done.txt, report.txt)
   ([#289])
 - Enable file completion for add-on actions via `_todo_file{1,2,3}_actions`
   ([#270])
 - Allow to customize what can be before / inside / after `+project` and
   `@context` ([#271])

### Changed
 - Read the task's name and uses as default ([#249])
 - Updated interpreter reference to use environment variable ([#160])
 - Allow setting of bash completion path ([#301])

### Fixes
 - Fixed no end-of-line bug. Supports todos with no end-of-line. ([#295])