Bump short version

Dean is not bumping the build / short version value :scream: 

Plan:

- [x] code to bump `CFBundleShortVersionString` bump
- [x] update bump process to bump short version as well

Wishlist:

- [ ] options to choose if bump `CFBundleShortVersionString` should match `CFBundleVersion` or be an incremental integer, a build number.
- [ ] update `.dean.yml` to set the value from there