Merge branch 'nb/send-email-no-dup-reply-to'

"git send-email --compose --reply-to=<address>" used to add
duplicated Reply-To: header, which made mailservers unhappy.  This
has been corrected.

* nb/send-email-no-dup-reply-to:
  send-email: don't duplicate Reply-to: in intro message

git-send-email.perl

@@ -1954,6 +1954,9 @@ sub pre_process_file {
 					$in_reply_to = $1;
 				}
 			}
+			elsif (/^Reply-To: (.*)/i) {
+				$reply_to = $1;
+			}
 			elsif (/^References: (.*)/i) {
 				if (!$initial_in_reply_to || $thread) {
 					$references = $1;