[gnome-builder/gnome-builder-3-30] rust: trigger the hover provider only on rust files

[Christian Hergert <chergert src gnome org>]

commit c567280a779a82e30e31a46bcc880be81f5e43ee
Author: Sebastien Lafargue <slafargue gnome org>
Date:   Wed Nov 7 22:14:56 2018 +0100

    rust: trigger the hover provider only on rust files

 src/plugins/rust-langserv/rust-langserv.plugin | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/src/plugins/rust-langserv/rust-langserv.plugin b/src/plugins/rust-langserv/rust-langserv.plugin
index 5092d8625..d33627223 100644
--- a/src/plugins/rust-langserv/rust-langserv.plugin
+++ b/src/plugins/rust-langserv/rust-langserv.plugin
@@ -10,5 +10,6 @@ X-Completion-Provider-Languages=rust
 X-Diagnostic-Provider-Languages=rust
 X-Formatter-Languages=rust
 X-Highlighter-Languages=rust
+X-Hover-Provider-Languages=rust
 X-Rename-Provider-Languages=rust
 X-Symbol-Resolver-Languages=rust