Merge pull request #2810 from stuckj/patch-1

Ignore build cache file for Android Studio 3.1+

Global/JetBrains.gitignore

@@ -61,3 +61,6 @@ fabric.properties
 
 # Editor-based Rest Client
 .idea/httpRequests
+
+# Android studio 3.1+ serialized cache file
+.idea/caches/build_file_checksums.ser