Update 8.3-to-8.4.md

doc/update/8.3-to-8.4.md

@@ -99,6 +99,10 @@ cd /home/git/gitlab
 sudo cp lib/support/init.d/gitlab /etc/init.d/gitlab
 ```
     
+For Ubuntu 16.04.1 LTS:
+
+    sudo systemctl daemon-reload
+
 ### 8. Start application
 
     sudo service gitlab start