cut another beta to address webpack issue

version bump

Bump changelog and version for production release

Bump version number for hotfix release

bump version to 1.2.2

Add note about diff text selection

Merge pull request desktop#4814 from desktop/bump-to-prod

promote to production

Merge pull request desktop#4791 from desktop/bump-for-new-git

bump embedded Git to latest version

Use the right version...for real this time

Merge pull request desktop#4748 from desktop/cccccccc-changelog

1.2.0 changelog