chore(deps): update dependency supertest to v6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
supertest	devDependencies	major	^5.0.0 -> ^6.0.1

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Release Notes

visionmedia/supertest

v6.0.1

Compare Source

• Merge pull request #​682 from vukanac/master a4c4596
• Removes space in front of backticks for code blocks in README.md f635fce

v6.0.0

Compare Source

• Merge pull request #​515 from holidaycheck/set-host-header-instead-of-adapting-url 7114571
• Set host header instead of host in url de056d2

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[codecov]

Codecov Report

Merging #751 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #751   +/-   ##
=======================================
  Coverage   99.15%   99.15%           
=======================================
  Files          10       10           
  Lines         236      236           
  Branches       72       72           
=======================================
  Hits          234      234           
  Misses          2        2           

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