Moving all references to proto v4

Change-Id: Idbb9119da7ddae136f7ffbbb783429c7e049b3ab
diff --git a/go/common/meta.pb.go b/go/common/meta.pb.go
index 8fbd621..0af225d 100644
--- a/go/common/meta.pb.go
+++ b/go/common/meta.pb.go
@@ -121,22 +121,22 @@
 
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