configure: update the copyright years for the output.

diff --git a/configure.ac b/configure.ac
index 3e0d184..5970188 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -31,7 +31,7 @@ XC_OVR_ZZ60
 CURL_OVERRIDE_AUTOCONF
 
 dnl configure script copyright
-AC_COPYRIGHT([Copyright (c) 1998 - 2012 Daniel Stenberg, <daniel@haxx.se>
+AC_COPYRIGHT([Copyright (c) 1998 - 2013 Daniel Stenberg, <daniel@haxx.se>
 This configure script may be copied, distributed and modified under the
 terms of the curl license; see COPYING for more details])