うまくソートされない

[wat-aro]

最後の出力が一番上に来るはずがなぜか最後になっている。

$ bin/issues ruby ruby 10
[ GithubRes { number: 1730, createdAt: 2017-10-27 15:14:34 UTC, title: Add Matrix#antisymmetric? and Matrix#reflexive? }
, GithubRes { number: 1732, createdAt: 2017-10-29 13:20:54 UTC, title: CAA DNS RR }
, GithubRes { number: 1747, createdAt: 2017-11-10 13:19:38 UTC, title: Add union method to Array }
, GithubRes { number: 1748, createdAt: 2017-11-13 06:23:46 UTC, title: URI::Generic: Respect no_proxy for both parent domain and subdomains }
, GithubRes { number: 1749, createdAt: 2017-11-13 09:52:58 UTC, title: change call CGI methods from :: to . }
, GithubRes { number: 1750, createdAt: 2017-11-13 14:28:35 UTC, title: Correct grammar mistake in README }
, GithubRes { number: 1753, createdAt: 2017-11-14 13:28:09 UTC, title: Set#^ is XOR }
, GithubRes { number: 1754, createdAt: 2017-11-15 06:41:07 UTC, title: FileUtils : Use Dir.children instead of Dir.entries }
, GithubRes { number: 1758, createdAt: 2017-11-16 10:29:34 UTC, title:  Add difference method to Array }
, GithubRes { number: 1723, createdAt: 2017-10-21 13:19:01 UTC, title: vm_core.h: add doxygen document comments }
]