* feat: Add pathspec support in git-missing
Allow to specify a path to limit the commit difference list. This
improvement allows users to focus on changes in specific directories or
files when comparing branches for missing commits.
* refactor: Improve pathspec handling in git-missing
- Change pathspec from string to array to support multiple pathspecs
- Remove unnecessary 'shift' command in argument processing loop
- Simplify git log command execution by using a single codepath
* chore: Update git-missing docs
* chore: Fix a typo in git-missing docs
Although Github reserves the 'visionmedia' user space(a visit to there
will be redirected to 'tj'), it's better to
rename the links from visionmedia/git-extras to tj/git-extras
