authorize an event on multiple state at the same time

[jeantuffier]

This would avoid declaring the same transitions from different states.
For example we could have a ShowLoading event transitioning to a LoadingShown from the Initial state but also from LoadingShown in case of navigation to another screen in mobile or web apps

[jeantuffier]

this has been fixed with : https://github.com/BeiningBogen/statemachine/releases/tag/v0.2.0-alpha