Update dependency supertest to v6.1.4

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
supertest	6.1.3 -> 6.1.4

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Release Notes

visionmedia/supertest

### [`v6.1.4`](https://togithub.com/visionmedia/supertest/releases/v6.1.4) [Compare Source](https://togithub.com/visionmedia/supertest/compare/v6.1.3...v6.1.4) - Merge pull request [#​715](https://togithub.com/visionmedia/supertest/issues/715) from juanvillegas/feature/allows-expect-to-take-an-array [`7e4645c`](https://togithub.com/visionmedia/supertest/commit/7e4645c) - Allows expect to accept an array of statuses [`ab252f3`](https://togithub.com/visionmedia/supertest/commit/ab252f3)

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