Update promise-js

[kevincennis]

Should resolve #345

[elasticsearch-release]

Jenkins standing by to test this. If you aren't a maintainer, you can ignore this comment. Someone with commit access, please review this and clear it for Jenkins to run; then say 'jenkins, test it'.

[spalger]

Thanks @kevincennis, would you mind signing the CLA so I can review your change?

[spalger]

Just saw your signature come through, thanks!