Upgrade golang-protobuf to v1.3.0

Test: build
Change-Id: Iff2b2c139c68250f29c3043a20a4440aee930d4b
diff --git a/METADATA b/METADATA
index 4302ffe..cda78be 100644
--- a/METADATA
+++ b/METADATA
@@ -8,10 +8,10 @@
     type: GIT
     value: "https://github.com/golang/protobuf"
   }
-  version: "9eb2c01ac278a5d89ce4b2be68fe4500955d8179"
+  version: "v1.3.0"
   last_upgrade_date {
-    year: 2018
-    month: 7
-    day: 6
+    year: 2019
+    month: 3
+    day: 13
   }
 }