Release to Bionic.

debian/changelog

@@ -1,11 +1,11 @@
-lubuntu-default-settings (0.53) UNRELEASED; urgency=medium
+lubuntu-default-settings (0.53) bionic; urgency=medium
 
   * Move some things around:
     - Lubuntu.desktop should be in lubuntu-default-session.
     - QLubuntu.desktop should be in qlubuntu-default-session.
     - Lubuntu-Netbook.desktop should be in lubuntu-extra-sessions.
 
- -- Simon Quigley <tsimonq2@ubuntu.com>  Sun, 11 Feb 2018 12:55:56 -0600
+ -- Simon Quigley <tsimonq2@ubuntu.com>  Sun, 11 Feb 2018 12:59:17 -0600
 
 lubuntu-default-settings (0.52) bionic; urgency=medium