[CLEANUP] update the year in the copyright banner

It was still 2010 !
diff --git a/src/haproxy.c b/src/haproxy.c
index 48c5741..350429a 100644
--- a/src/haproxy.c
+++ b/src/haproxy.c
@@ -171,7 +171,7 @@
 void display_version()
 {
 	printf("HA-Proxy version " HAPROXY_VERSION " " HAPROXY_DATE"\n");
-	printf("Copyright 2000-2010 Willy Tarreau <w@1wt.eu>\n\n");
+	printf("Copyright 2000-2011 Willy Tarreau <w@1wt.eu>\n\n");
 }
 
 void display_build_opts()