[gnome-user-docs] Add make check to gitlab-ci

[Petr Kovář <pmkovar src gnome org>]

commit 92e18925a22a615428c72636d7a5c515f8702da3
Author: Petr Kovar <pkovar redhat com>
Date:   Mon Dec 10 00:04:59 2018 +0100

    Add make check to gitlab-ci
    
    Helps #26. We still don't fail on unsuccessful itstool merge.

 .gitlab-ci.yml | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index c6aac02f..53e3afdc 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -5,3 +5,4 @@ build-fedora:
   script:
     - ./autogen.sh
     - make
+    - make check