Fix maintainers check

[matt-gadd]

Expected behaviour:
Can publish to npm with a maintainer in the maintainer list

Actual behaviour:
Failed the npm maintainer check.

For some reason I was only checking against the first maintainer in the array.

We dearly need some tests for the grunt tasks: #1

[jquerybot]

Thank you for your pull request. It looks like this may be your first contribution to a jQuery Foundation project, if so we need you to sign our Contributor License Agreement (CLA).

📝 Please visit http://contribute.jquery.org/CLA/ to sign.

After you signed, the PR is checked again automatically after a minute. If there's still an issue, please reply here to let us know.

---

If you've already signed our CLA, it's possible your git author information doesn't match your CLA signature (both your name and email have to match), for more information, check the status of your CLA check.

[codecov-io]

Current coverage is 27.36% (diff: 100%)

Merging #58 into master will not change coverage

@@             master        #58   diff @@
==========================================
  Files            10         10          
  Lines           285        285          
  Methods           0          0          
  Messages          0          0          
  Branches          0          0          
==========================================
  Hits             78         78          
  Misses          207        207          
  Partials          0          0          

Powered by Codecov. Last update cd7858a...595d390