Error regarding initializing firebase (need to update to mixpnael SDK v5.6.8)

[mhdtouban]

We are getting the following error when building the project on android. java.lang.IllegalStateException: Default FirebaseApp is not initialized in this process com.healthie.healthReel. Make sure to call FirebaseApp.initializeApp(Context) first.

This has been fixed in mixpnael SDK v5.6.7.

You need to support the latest mixpanel SDK as there is a bug fix in 5.6.7 regarding firebase initialization. https://github.com/mixpanel/mixpanel-android/releases/tag/v5.6.7

[lorenc-tomasz]

PR: https://github.com/davodesign84/react-native-mixpanel/pull/207