`unhandledrejection` event is missing `detail` field

[jesenko]

Issue was introduced in v3.4.2, version v3.4.1 works as expected.

See https://plnkr.co/edit/JupPtN7ipi5AGS5KJUZm?p=preview for example (detail field of handled event is null, however it should contain promise and reason).

Tested in Chrome 52