Improve gapi HttpRequestPromise thanks to TypeScript 2.3

[tkrotoff]

TypeScript 2.3 has been released, let's improve gapi HttpRequestPromise.

See the related TypeScript promise issue that has been fixed with version 2.3

Not to be merged yet: Travis CI will fail until TypeScript 2.3 is supported

[dt-bot]

types/gapi/index.d.ts

to author (@sgtfrankieboy). Could you review this PR?
👍 or 👎?

Checklist

• pass the Travis CI test?

[mhegazy]

Thanks for your contribution. This PR has failing CI tests and can not be merged in at the time being. For housekeeping purposes we are closing stale PRs. If you'd still like to merge this code in, please open a new PR that has been merged and rebased with the master branch.

[tkrotoff]

@mhegazy This PR is valid and has been reviewed. It's just waiting for DefinitelyTyped to support TypeScript 2.3 => that's why Travis CI fails
Please re-open

[rbuckton]

@tkrotoff I re-ran the Travis CI build and it is still failing. This is because the following DT packages depend on gapi and have not also been updated to include // TypeScript Version: 2.3:

• gapi.analytics
• gapi.auth2
• gapi.calendar
• gapi.pagespeedonline
• gapi.people
• gapi.plus
• gapi.translate
• gapi.urlshortener
• gapi.youtube
• gapi.youtubeanalytics

You can see the build errors here: https://travis-ci.org/DefinitelyTyped/DefinitelyTyped/builds/226723664

Please correct the above errors and resubmit a new PR. Thanks!

[tkrotoff]

@rbuckton If you reopen this PR, I would be able to fix the other definitions...

[tkrotoff]

@rbuckton thx :)

[tkrotoff]

@rbuckton would be nice to have an announcement system (like https:/aspnet/Announcements ?) so contributors are aware when a new version of TypeScript is supported on DefinitelyTyped