Fix ChangeLog entry.

ChangeLog

@@ -9,7 +9,7 @@ version 0.9.8 -- UNRELEASED
 	 . Use duplicity's --extra-clean option to get rid of unnecessary old
 	   cache files when cleaning up. This is enabled when using duplicity
 	   0.6.01 or newer, that depends on local caching (Closes: #572721)
-	 . dup: ignore anything but digits and "." when comparing versions
+	 . Ignore anything but digits and "." when comparing versions
 	   (Closes: #578987)
 	 . Put archive directory (cache) into /var/backups/duplicity rather
 	   than the default /root/.cache/duplicity, unless the user