Fiam make nonrequired (#3073)

Author: christibbs

.travis.yml

@@ -363,6 +363,8 @@ jobs:
       - PROJECT=Firestore PLATFORM=iOS METHOD=xcodebuild SANITIZERS=tsan
     - env:
       - PROJECT=GoogleDataTransportIntegrationTest PLATFORM=iOS METHOD=xcodebuild
+    - env:
+      - PROJECT=InAppMessaging PLATFORM=iOS METHOD=xcodebuild
 
   # TODO(varconst): enable if it's possible to make this flag work on build
   # stages. It's supposed to avoid waiting for jobs that are allowed to fail