tests/mod.go: Update of go.mod after move of integration tests.
@@ -11,6 +11,7 @@ require (
github.com/etcd-io/gofail v0.0.0-20190801230047-ad7f989257ca
github.com/gogo/protobuf v1.2.1
github.com/golang/protobuf v1.3.2
+ github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0
github.com/grpc-ecosystem/grpc-gateway v1.9.5
github.com/prometheus/client_golang v1.0.0
github.com/soheilhy/cmux v0.1.4
