MINOR: http: status code 303 is HTTP/1.1 only

Don't return a 303 redirect with "HTTP/1.0" as it's HTTP/1.1 only.
diff --git a/src/proto_http.c b/src/proto_http.c
index 0f14016..4644acf 100644
--- a/src/proto_http.c
+++ b/src/proto_http.c
@@ -2979,7 +2979,7 @@
 		 * the browse to the stats page with a GET.
 		 */
 		chunk_printf(&trash,
-		             "HTTP/1.0 303 See Other\r\n"
+		             "HTTP/1.1 303 See Other\r\n"
 		             "Cache-Control: no-cache\r\n"
 		             "Content-Type: text/plain\r\n"
 		             "Connection: close\r\n"