[fractal/clippy-ci] CI: use clippy for more tests

[Alexandre Franke <afranke src gnome org>]

commit 55ff99e8186d3962b8cb911e5902473f8a9608e0
Author: Alexandre Franke <afranke gnome org>
Date:   Thu Dec 5 23:25:11 2019 +0100

    CI: use clippy for more tests

 .gitlab-ci.yml | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index f820cf59..37181096 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -30,6 +30,7 @@ check:
         - rustc -Vv && cargo -Vv
         - cargo --version
         - cargo fmt --all -- --check
+        - cargo clippy -- -D warnings
 
 flatpak:
   extends: '.flatpak'