add pub id

Author: darunrs

lazer/publisher_sdk/proto/publisher_update.proto

@@ -9,8 +9,12 @@ message PublisherUpdate {
   // Array of updates, each of which target a single feed
   repeated FeedUpdate updates = 1;
 
+  // ID of the Publisher that is sending the update
+  // Should match ID stored in Pyth Lazer
+  optional uint32 publisher_id = 2;
+
   // Timestamp when this message was created
-  optional google.protobuf.Timestamp publisher_timestamp = 2;
+  optional google.protobuf.Timestamp publisher_timestamp = 3;
 }
 
 // Update to a feed. May contain different types of data depending on what kind of update it is