SEBA-973 Update kafka topic exporter to support voltha 2.0 KPI2 event types
Needs to be merged after mergeing VOL-2948

Change-Id: I29620969773d555294ce6eefe7cf52be6df63225
diff --git a/Gopkg.toml b/Gopkg.toml
index ebbf24e..be6f760 100644
--- a/Gopkg.toml
+++ b/Gopkg.toml
@@ -62,3 +62,7 @@
 [prune]
   go-tests = true
   unused-packages = true
+
+[[constraint]]
+  name = "github.com/golang/protobuf"
+  version = "1.3.2"