[librsvg] Run the stage_2 CI for the librsvg-2.42 branch.

[Federico Mena Quintero <federico src gnome org>]

commit 836309eb5c2bf3942e07272edeb97d055d92e072
Author: Federico Mena Quintero <federico gnome org>
Date:   Fri May 4 13:42:49 2018 -0500

    Run the stage_2 CI for the librsvg-2.42 branch.

 .gitlab-ci.yml | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 434655f5..f66e1021 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -86,6 +86,7 @@ stages:
   only:
     # When branching a stable branch,
     # update the following line from master to branch's name.
+    - librsvg-2.42@GNOME/librsvg
     - master@GNOME/librsvg
     - schedules
     - tags