VOL-3419: Replicate voltha flows in openolt agent
- The scale-tester-app will adhere to new openolt.proto interface (version 4.0.2)
and will pass necessary information for openolt-agent to replicate the flows.
- upgrade to voltha-lib-go version 4.0.0

Change-Id: I9d862929ae8ac4468d4e93096f8cd8e16f26ec93
diff --git a/go.mod b/go.mod
index 6100676..2a734dc 100644
--- a/go.mod
+++ b/go.mod
@@ -4,8 +4,8 @@
 
 require (
 	github.com/cenkalti/backoff/v3 v3.1.1
-	github.com/opencord/voltha-lib-go/v3 v3.0.20
-	github.com/opencord/voltha-protos/v3 v3.2.6
+	github.com/opencord/voltha-lib-go/v4 v4.0.0
+	github.com/opencord/voltha-protos/v4 v4.0.2
 	golang.org/x/net v0.0.0-20190930134127-c5a3c61f89f3
 	google.golang.org/grpc v1.24.0
 )