Update to support fastlane 2.0

* Note: Previous fastlane 2.0 compatible releases were removed due to cyclic dependency errors
* This release is only compatible with fastlane 2.0. To continue using fastlane 1, please use older releases
* Calling `<tool-name>` from the commandline is now deprecated. Please use `fastlane <tool-name>` instead.

https://github.com/fastlane-old/screengrab/releases/tag/1.0.0
