gRPC migration

Change-Id: Ib390f6dde0d5a8d6db12ccd7da41135570ad1354
diff --git a/vendor/golang.org/x/net/idna/idna9.0.0.go b/vendor/golang.org/x/net/idna/idna9.0.0.go
index 8842146..7c74563 100644
--- a/vendor/golang.org/x/net/idna/idna9.0.0.go
+++ b/vendor/golang.org/x/net/idna/idna9.0.0.go
@@ -4,6 +4,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build !go1.10
 // +build !go1.10
 
 // Package idna implements IDNA2008 using the compatibility processing