Update to 4.0.0 deepEqual

[aaronjensen]

https://github.com/nodejs/LTS/wiki/Breaking-changes-between-v0.12-and-next-LTS-release#assert-check-object-prototype-in-assertdeepequal

nodejs/node#621

This changes the method semantics so it should be a major version bump like node did probably.

Will address mjackson/expect#17

[johman10]

For other people finding this issue.
This library has the option to sent in options and it accepts a strict mode.
To do what is requested here one can do:

import deepEqual from 'deep-equal';

const array = { test: ['1', '2', '3'] };
const array2 = { test: [1, 2, 3] };

deepEqual(array, array2) // false
deepEqual(array, array2, { strict: true }); // true

Related code can be found here: https://github.com/substack/node-deep-equal/blob/master/index.js#L17

Hope this helps others finding this an issue. ;)