use go 1.12

Signed-off-by: hongming <talonwan@yunify.com>

vendor/github.com/lucas-clemente/quic-go/h2quic/response_writer_closenotifier.go

@@ -0,0 +1,9 @@
+package h2quic
+
+import "net/http"
+
+// The CloseNotifier is a deprecated interface, and staticcheck will report that from Go 1.11.
+// By defining it in a separate file, we can exclude this file from staticcheck.
+
+// test that we implement http.CloseNotifier
+var _ http.CloseNotifier = &responseWriter{}