Enable 'CollectionIncompatibleType' error prone check

Change-Id: I97161694e068712a45f4c5f6c85ed7daf72edddc
diff --git a/build.gradle b/build.gradle
index d15934b..03cec06 100644
--- a/build.gradle
+++ b/build.gradle
@@ -610,6 +610,7 @@
         options.errorprone.enabled = true
         options.errorprone.disableAllChecks = true
         options.errorprone.check('ClassCanBeStatic', CheckSeverity.ERROR)
+        options.errorprone.check('CollectionIncompatibleType', CheckSeverity.ERROR)
         options.errorprone.check('OperatorPrecedence', CheckSeverity.ERROR)
         options.errorprone.check('RemoveUnusedImports', CheckSeverity.ERROR)
         options.errorprone.check('MissingOverride', CheckSeverity.ERROR)