Moving all references to proto v4

Change-Id: Idbb9119da7ddae136f7ffbbb783429c7e049b3ab
diff --git a/protos/voltha_protos/ext_config.proto b/protos/voltha_protos/ext_config.proto
index 47113e9..bfefd98 100644
--- a/protos/voltha_protos/ext_config.proto
+++ b/protos/voltha_protos/ext_config.proto
@@ -13,7 +13,7 @@
 // limitations under the License.
 syntax = "proto3";
 
-option go_package = "github.com/opencord/voltha-protos/v3/go/ext/config";
+option go_package = "github.com/opencord/voltha-protos/v4/go/ext/config";
 
 package config;