[VOL-4290] Voltha go library updates for gRPC migration

Change-Id: I1aa2774beb6b7ed7419bc45aeb53fcae8a8ecda0
diff --git a/vendor/github.com/grpc-ecosystem/go-grpc-middleware/.gitignore b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/.gitignore
index c198e6a..826caa3 100644
--- a/vendor/github.com/grpc-ecosystem/go-grpc-middleware/.gitignore
+++ b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/.gitignore
@@ -200,3 +200,5 @@
 
 #vendor
 vendor/
+
+.envrc
\ No newline at end of file