[recipes/fix-ci] ci: Add diff dependency

[Matthew Leeds <mwleeds src gnome org>]

commit 6cb3950c514919963fcc8c686c55f5db2f4f90f3
Author: Matthew Leeds <matthew leeds endlessm com>
Date:   Fri Feb 14 22:31:39 2020 -0800

    ci: Add diff dependency
    
    We use the diff command in the unit tests.

 .gitlab-ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 62532fb..4b652dc 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,7 +1,7 @@
 build-fedora:
   image: fedora:latest
   before_script:
-    - dnf install -y git gcc meson gettext itstool gtk3-devel gnome-autoar-devel gnome-online-accounts-devel 
gspell-devel libcanberra-devel libsoup-devel rest-devel json-glib-devel
+    - dnf install -y git gcc meson gettext itstool gtk3-devel gnome-autoar-devel gnome-online-accounts-devel 
gspell-devel libcanberra-devel libsoup-devel rest-devel json-glib-devel diffutils
   script:
     - meson build
     - ninja -C build