Update RemoteMessage.java

Author: nidhidavawala

firebase-messaging/src/main/java/com/google/firebase/messaging/RemoteMessage.java

@@ -35,8 +35,8 @@
 import com.google.firebase.messaging.Constants.MessagePayloadKeys;
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
-import java.util.Map;
 import java.util.HashMap;
+import java.util.Map;
 
 /**
  * A remote Firebase Message.