Add URLSearchParams and Headers to eslint globals

[sonnyp]

Fix eslint complaining about URLSearchParams and Headers not being defined.

[pull-bot]

	Messages
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📖	📋 Missing Test Plan - Can you add a Test Plan? To do so, add a "## Test Plan" section to your PR description. A Test Plan lets us know how these changes were tested.
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Generated by 🚫 dangerJS against c1a3144

[matt-oakes]

Can you also bump the version number in the packages package.json so I can release it when this PR is merged?

[sonnyp]

@matt-oakes done - also added Headers to eslint globals

[matt-oakes]

This looks good to me! This will need to be merged by someone with the correct permissions (cc @cpojer) and then I can release a new version onto NPM.

[cpojer]

Thank you!

[facebook-github-bot]

@cpojer is landing this pull request. If you are a Facebook employee, you can view this diff on Phabricator.

[react-native-bot]

This pull request was successfully merged by @sonnyp in 7a13a1a.

^{When will my fix make it into a release? | Upcoming Releases}

[matt-oakes]

Published to NPM as 0.0.7 👍