Update set-up-gdk.md

f89128be · Zeger-Jan van de Weg · 891baa55 · f89128be
Commit f89128be authored 8 years ago by Zeger-Jan van de Weg
--- a/doc/set-up-gdk.md
+++ b/doc/set-up-gdk.md
@@ -57,7 +57,7 @@ instead of 3000 so that you can run GDK EE next to CE without port
 conflicts.
  
 ```
-gem install gdk
+gem install gitlab-development-kit
 gdk init gdk-ee
 cd gdk-ee
 echo 3001 > port