gRPC migration update

Change-Id: Icdd1a824948fa994cd36bd121c962f5ecf74e3cf
diff --git a/vendor/github.com/Shopify/sarama/offset_commit_response.go b/vendor/github.com/Shopify/sarama/offset_commit_response.go
index e842298..342260e 100644
--- a/vendor/github.com/Shopify/sarama/offset_commit_response.go
+++ b/vendor/github.com/Shopify/sarama/offset_commit_response.go
@@ -94,6 +94,10 @@
 	return r.Version
 }
 
+func (r *OffsetCommitResponse) headerVersion() int16 {
+	return 0
+}
+
 func (r *OffsetCommitResponse) requiredVersion() KafkaVersion {
 	switch r.Version {
 	case 1: