ISSUE_TEMPLATE

there is a known issue with Firebase SDK with iOS 11
https://github.com/firebase/quickstart-ios/issues/327#issuecomment-331782299
fix is `pod 'FirebaseInstanceID', "2.0.0"`

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1. Reproduce it with the example project in this repo.
2. If you can't receive iOS notification, make sure you can receive notification using quickstart-ios project provided by Firebase team

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