support HTTP code 418

418 I'm a teapot was a result of RFC2324 which was an April 1 RFC. See
rfc9110 for more detailed information.

It is still very useful to allow for creating easter eggs and generally
make life more fun. And as we all know, boring is worse than death.

This is only my personal opinion, but anyway, it is the only correct opinion.

ext/iodine/http.c

@@ -2696,6 +2696,7 @@ fio_str_info_s http_status2str(uintptr_t status) {
       HTTP_SET_STATUS_STR(415, "Unsupported Media Type"),
       HTTP_SET_STATUS_STR(416, "Range Not Satisfiable"),
       HTTP_SET_STATUS_STR(417, "Expectation Failed"),
+      HTTP_SET_STATUS_STR(418, "I'm a teapot"),
       HTTP_SET_STATUS_STR(421, "Misdirected Request"),
       HTTP_SET_STATUS_STR(422, "Unprocessable Entity"),
       HTTP_SET_STATUS_STR(423, "Locked"),