[Snyk] Upgrade supertest from 3.3.0 to 3.4.2

[snyk-bot]

Snyk have raised this PR to upgrade supertest from 3.3.0 to 3.4.2.

• The recommended version is 3 versions ahead of your current version.
• The recommended version was released 7 months ago, on 2019-01-22.

Release notes

• 3.4.2 - 2019-01-22
  • PR-542 - Update dependencies. (thanks @rimiti)
  • PR-537 - Fix and update documentation. (thanks @rimiti)
  • PR-536 - Do not publish useless files. (thanks @rimiti)
• 3.4.1 - 2019-01-16
  • PR-535 - Fix #534 - Superagent downgrading (thanks @rimiti)
  • PR-533 - Only publish necessary files (thanks @rimiti)
• 3.4.0 - 2019-01-16
  • PR-532 - Packages updated, pipeline more explicit, documentation updated (thanks @rimiti)
  • PR-517 - Documentation updated (thanks @oprogramador)
  • PR-513 - Use more robust Array instance check (thanks @rubendg)
• 3.3.0 - 2018-09-06

  #509 - Fix #486, bug in _assertBody, switch to deepStrictEqual (thanks @mikelax)
  #510 - Refactor test files to use const/let (thanks @rimiti)

from supertest GitHub Release Notes

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