mutt: update UPDATING with 1.5.22 release date

[Brendan Cully]

changeset: 6323:b9693e10f431
user:      Michael Elkins <m...@sigpipe.org>
date:      Fri Oct 18 14:12:08 2013 -0700
link:      http://dev.mutt.org/hg/mutt/rev/b9693e10f431

update UPDATING with 1.5.22 release date

diffs (12 lines):

diff -r 6f5fe49fdf64 -r b9693e10f431 UPDATING
--- a/UPDATING  Thu Oct 17 22:55:27 2013 -0700
+++ b/UPDATING  Fri Oct 18 14:12:08 2013 -0700
@@ -4,7 +4,7 @@
 The keys used are:
   !: modified feature, -: deleted feature, +: new feature
 
-1.5.22 (2013-xx-xx):
+1.5.22 (2013-10-18):
 
   ! $imap_keepalive default lowered to 300
   + $reflow_text, $reflow_wrap for finer control of flowed wrapping