dpkg-deb(1): Document default compressor change to xz

Commit 16ab055e95a804a1fc176c7bd72b52a2be8412ab for dpkg 1.17.0 changed
the default compressor from gzip to xz. Adjust dpkg-deb man page to
document this change.

Signed-off-by: Guillem Jover <guillem@debian.org>

debian/changelog

@@ -4,6 +4,8 @@ dpkg (1.17.2) UNRELEASED; urgency=low
     on exact 'any' strings, instead of substrings.
   * Add manpages-it Replaces to dselect and dpkg-dev. Closes: #717983
     Reported by Andreas Beckmann <anbe@debian.org>.
+  * Document default dpkg-deb compressor change to xz in man page.
+    Thanks to Salvatore Bonaccorso <carnil@debian.org>. Closes: #718437
 
  -- Guillem Jover <guillem@debian.org>  Sun, 28 Jul 2013 15:06:29 +0200
 

man/dpkg-deb.1

@@ -230,7 +230,7 @@ gzip (since dpkg 1.17.0) and \fIextreme\fP for xz.
 .BI \-Z compress-type
 Specify which compression type to use when building a package. Allowed
 values are \fIgzip\fP, \fIxz\fP, \fIbzip2\fP, \fIlzma\fP, and \fInone\fP
-(default is \fIgzip\fP).
+(default is \fIxz\fP).
 .TP
 .BI \-\-deb\-format= format
 Set the archive format version used when building (since dpkg 1.17.0).