Use Firebase/Crashlytics instead of Crashlytics.
Use Firebase/Crashlytics instead of Crashlytics.

The previous version of Crashlytics (3.x) was missing
some headers required for Unity builds.

firebase/firebase-cpp-sdk,firebase/firebase-cpp-sdk,firebase/firebase-cpp-sdk,firebase/firebase-cpp-sdk,firebase/firebase-cpp-sdk,firebase/firebase-cpp-sdk,firebase/firebase-cpp-sdk,firebase/firebase-cpp-sdk