Warning: Add license to `package.json`
Warning: Add license to `package.json`

Removes the warning
```
npm WARN EPACKAGEJSON _lifecycle@1.0.2 No license field.
```

during `npm install` by adding the
[MIT license](https://spdx.org/licenses/)
that is used in `LICENSE` to
[package.json](https://docs.npmjs.com/files/package.json)

ax3l/lifecycle,kmalakoff/lifecycle,ax3l/lifecycle,kmalakoff/lifecycle