Use https:// for gitlab URL

Gauvain Pocentek · Gauvain Pocentek · commit 256518cc1fab · 2018-09-04T16:56:01.000+02:00
diff --git a/docs/switching-to-v4.rst b/docs/switching-to-v4.rst
@@ -10,7 +10,7 @@ solve some problems with the existing one.
 
 GitLab will stop supporting the v3 API soon, and you should consider switching
 to v4 if you use a recent version of GitLab (>= 9.0), or if you use
-http://gitlab.com.
+https://gitlab.com.
 
 
 Using the v4 API
