UIWindowScene compatibility fix

Fix crash retrieving application window on applications using scene delegate

UIWindowScene support

Add support for getting the window from UIWindowSceneDelegate instead of UIApplicationDelegate

1.3

Merge pull request #15 from mirego/task/init-with-version

Add a parameter to init the KillSwitch with a version number

tvOS support

Merge pull request #9 from mirego/feature/modernize_and_support_tvos

Support tvOS by converting to UIAlertController

0.3.1

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