chore(deps): update dependency supertest to v3.4.1

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
supertest	devDependencies	minor	3.3.0 -> 3.4.1	source

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Release Notes

visionmedia/supertest

### [`v3.4.1`](https://togithub.com/visionmedia/supertest/blob/master/History.md#​341--2019-01-16) [Compare Source](https://togithub.com/visionmedia/supertest/compare/v3.4.0...v3.4.1) =================== - PR-535 - Fix [#​534](https://togithub.com/visionmedia/supertest/issues/534) - Superagent downgrading (thanks [@​rimiti](https://togithub.com/rimiti)) - PR-533 - Only publish necessary files (thanks [@​rimiti](https://togithub.com/rimiti)) ### [`v3.4.0`](https://togithub.com/visionmedia/supertest/blob/master/History.md#​340--2019-01-15) [Compare Source](https://togithub.com/visionmedia/supertest/compare/v3.3.0...v3.4.0) =================== - PR-532 - Packages updated, pipeline more explicit, documentation updated (thanks [@​rimiti](https://togithub.com/rimiti)) - PR-517 - Documentation updated (thanks [@​oprogramador](https://togithub.com/oprogramador)) - PR-513 - Use more robust Array instance check (thanks [@​rubendg](https://togithub.com/rubendg))

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