Tests: adapted js_dump.t to upcoming changes in 0.5.0.

After 0.5.0 responseBody property remains but becomes non-enumerable and
finally will be removed in the future releases.
diff --git a/js_dump.t b/js_dump.t
index 02eddc2..2d80abd 100644
--- a/js_dump.t
+++ b/js_dump.t
@@ -103,6 +103,6 @@
 like(http(
 	'GET /stringify_subrequest HTTP/1.0' . CRLF
 	. 'Host: localhost' . CRLF . CRLF
-), qr/responseBody":"\{GET}"/, 'JSON.stringify(reply)');
+), qr/"status":201/, 'JSON.stringify(reply)');
 
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