Fix lib to use iOS 10.x and Android JSC

[newyankeecodeshop]

Summary

Now that React Native 0.63 requires iOS 10.x, and bundles a modern version of JSC on Android, we can update the JavaScript library version to es2017. That brings in declarations for:

• Array.prototype.includes
• Object.entries and Object.values
• String.padStart and String.padEnd

Also, the version of Node that React Native requires, 10.x, also supports these APIs.

Test Plan

Ran yarn run tsc in the template application and no errors were found.

What's required for testing (prerequisites)?

N/A

What are the steps to reproduce (after prerequisites)?

N/A

Compatibility

OS	Implemented
iOS	✅
Android	✅

Checklist

• I have tested this on a device and a simulator
• I added the documentation in README.md
• I mentioned this change in CHANGELOG.md
• I updated the typed files (TS and Flow)
• I added a sample use of the API in the example project (example/App.js)

[newyankeecodeshop]

@radko93 @emin93 This has been open several months. Is anyone going to review it or should I just close it?

[emin93]

Thanks for pinging and the patience. Of course this makes sense to include, so I approved it.