[gnome-builder] go-langserv: add missing language restriction

[Christian Hergert <chergert src gnome org>]

commit 3584e0df68b1a8703e58f8471995ec1075129d6d
Author: Christian Hergert <chergert redhat com>
Date:   Sat Apr 27 12:31:52 2019 -0700

    go-langserv: add missing language restriction

 src/plugins/go-langserv/go-langserv.plugin | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/src/plugins/go-langserv/go-langserv.plugin b/src/plugins/go-langserv/go-langserv.plugin
index 941174cde..ec0e2301a 100644
--- a/src/plugins/go-langserv/go-langserv.plugin
+++ b/src/plugins/go-langserv/go-langserv.plugin
@@ -7,4 +7,6 @@ Loader=python3
 Module=go_langserver_plugin
 Name=Go Language Server Plugin
 X-Builder-ABI=@PACKAGE_ABI@
+X-Completion-Provider-Languages=go
+X-Hover-Provider-Languages=go
 X-Symbol-Resolver-Languages=go