releasing package livecd-rootfs version 2.455

debian/changelog

@@ -1,9 +1,9 @@
-livecd-rootfs (2.455) UNRELEASED; urgency=medium
+livecd-rootfs (2.455) artful; urgency=medium
 
   * Restore the call to 'umount -R $mountpoint' from umount_partition,
     accidentally dropped in previous upload.
 
- -- Steve Langasek <steve.langasek@ubuntu.com>  Wed, 13 Sep 2017 12:49:24 -0700
+ -- Steve Langasek <steve.langasek@ubuntu.com>  Wed, 13 Sep 2017 12:50:10 -0700
 
 livecd-rootfs (2.454) artful; urgency=medium