Link some changelog entries in the description.

debian/changelog

@@ -1,10 +1,10 @@
 calamares-settings-ubuntu (7) UNRELEASED; urgency=medium
 
-  * Fix geoip timezone detection.
+  * Fix geoip timezone detection (LP: #1781310).
   * Update translations and add support for Portuguese and Brazilian
     Portuguese.
   * Ensure that calamares.desktop is removed from all new users on a
-    freshly-installed system.
+    freshly-installed system (LP: #1781309).
   * Also remove calamares after install.
 
  -- Simon Quigley <tsimonq2@ubuntu.com>  Wed, 11 Jul 2018 22:35:58 -0500