Minor fix to gitlog-to-changelog

[Sergey Poznyakoff]

Hello,

In the output of gitlog-to-changelog, subject lines
are not separated from the body. This fix adds an extra newline
and fixes this. Any objections to push it?

Regards,
Sergey

diff --git a/build-aux/gitlog-to-changelog b/build-aux/gitlog-to-changelog
index 1cc53eb..a4a0c1d 100755
--- a/build-aux/gitlog-to-changelog
+++ b/build-aux/gitlog-to-changelog
@@ -104,7 +104,7 @@ sub quoted_cmd(@)
     ) or usage 1;
 
   my @cmd = (qw (git log --log-size), "--since=$since_date",
-             '--pretty=format:%ct  %an  <%ae>%n%n%s%n%b%n', @ARGV);
+             '--pretty=format:%ct  %an  <%ae>%n%n%s%n%n%b%n', @ARGV);
   open PIPE, '-|', @cmd
     or die ("$ME: failed to run `". quoted_cmd (@cmd) ."': $!\n"
             . "(Is your Git too old?  Version 1.5.1 or later is required.)\n");