Add support for optional chaining

[ghost]

Hello. With Node 14, ?. added to use but JSHint shows as error. I can avoid it by manually doing // jshint ignore:line, but I think it might be more appropriate if support comes in. Thank you

[jugglinmike]

The feature you're looking for is called "optional chaining," and we have it on the roadmap for the next major release:

#3486

I'll rename this issue to help others find it.

[jugglinmike]

JSHint version 2.13.0, released today, includes support for optional chaining. Be sure to update your configuration to opt in to the new language feature via esversion: 11 or later.