Upgrade golang-protobuf to v1.3.4

Exempt-From-Owner-Approval: Upgrade
Test: None
Change-Id: Id15e8d315efee22b2b6c37ae4358fd8a08502d24
diff --git a/METADATA b/METADATA
index 5c61f49..e4adcf7 100644
--- a/METADATA
+++ b/METADATA
@@ -8,10 +8,10 @@
     type: GIT
     value: "https://github.com/golang/protobuf"
   }
-  version: "v1.3.2"
+  version: "v1.3.4"
   last_upgrade_date {
-    year: 2019
-    month: 3
-    day: 13
+    year: 2020
+    month: 2
+    day: 26
   }
 }