Fix typo fix

backup/debian/changelog

-symbiosis-backup (2018:0831) stable; urgency=medium
+symbiosis-backup (2018:0820) stable; urgency=medium
 
   * Prevented *.lock from being synced to backup space.
 
  -- Paul Cammish <paul.cammish@bytemark.co.uk>  Mon, 20 Aug 2018 12:08:00 +0100
 
-symbiosis-backup (2018:0830) stable; urgency=medium
+symbiosis-backup (2018:0730) stable; urgency=medium
 
   * Removed output when not finding deprecated Bytemark backup space.
   * Added jobs to temporarily move lock file when doing space estimation.