Add InAppMessaging to Carthage template (#2006)

Author: paulb777

Carthage.md

@@ -39,6 +39,8 @@ binary "https://dl.google.com/dl/firebase/ios/carthage/FirebaseDatabaseBinary.js
 binary "https://dl.google.com/dl/firebase/ios/carthage/FirebaseDynamicLinksBinary.json"
 binary "https://dl.google.com/dl/firebase/ios/carthage/FirebaseFirestoreBinary.json"
 binary "https://dl.google.com/dl/firebase/ios/carthage/FirebaseFunctionsBinary.json"
+binary "https://dl.google.com/dl/firebase/ios/carthage/FirebaseInAppMessagingBinary.json"
+binary "https://dl.google.com/dl/firebase/ios/carthage/FirebaseInAppMessagingDisplayBinary.json"
 binary "https://dl.google.com/dl/firebase/ios/carthage/FirebaseInvitesBinary.json"
 binary "https://dl.google.com/dl/firebase/ios/carthage/FirebaseMessagingBinary.json"
 binary "https://dl.google.com/dl/firebase/ios/carthage/FirebaseMLModelInterpreterBinary.json"