Don't reject jQuery >= 3.0.0

[mgol]

jQuery 3.0 & jQuery Compat 3.0 promises will be Promises/A+-compliant (current master & 3.0.0-alpha1 pass the whole promises-aplus-tests@2.1.0 suite, we have it enforced in CI) so it'd be good if Chai as Promised didn't reject them.

jQuery 3.0 adds catch (defined as fn => promise.then(null, fn)) to its promises so it should be enough to modify this check; if thenable.catch exists, the promise should be fine.

Please let us know if there are still some problems that would prevent you to consume jQuery Promises. You can test on jquery@beta.

[keithamus]

@mzgol would it be too cheeky to request a PR fixing this? I understand if your plate is full but it seems like it'd be a good idea as you have the best grasp of the issue.

[mgol]

Sure, I can submit a PR. I just wanted to get some feedback first. :)

[domenic]

Yeah, seems good. Probably also want to modify the error message a bit later.

[mgol]

WIP PR: #122. I need some help with it (3 tests are failing).

[domenic]

Fixed in v5.3.0.