optimizely / javascript-sdk / 358

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feat(package.json): Codify supported Node.js in engines property (#143)

## Summary

- Add [`engines`](https://docs.npmjs.com/files/package.json#engines) property, which will warn users if they `npm install` us and are on a ye olde Node.js version
- Call this package's README the "homepage", rather than the one in the repo root which makes kind of a weird first impression
- Delete extraneous word in package description

## Test plan
Ran `>=4.0.0` through http://jubianchi.github.io/semver-check/ to make sure it allows/denies versions in the way I expect.

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