Improvements

* Added `danger` action
* Added `flock` action
* Change `Actions.sh` to call `UI.user_error` for a non-zero exit code
* Augment `verify_xcode` action's accepted codesign info
* Proper escaping in `upload_symbols_to_crashlytics` params
* Add to bash and zsh completion scripts support of .fastlane folder
* Add additional parameters to `notification` action
* Add 'workspace' option to `slather` action
* Improved actions list, shows default value

https://github.com/fastlane/fastlane/releases/tag/1.82.0
