fix(deps): update dependency superagent to v6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
superagent	5.3.1 -> 6.1.0

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Release Notes

visionmedia/superagent

v6.1.0

Compare Source

• fix: use qs to serialize form data in browser (#​1591) aa43b3d
• Create FUNDING.yml f817806
• docs: updated docs, set to master branch 6a31af9
• chore: updated docs 484f890

v6.0.0

Compare Source

• fix: bump deps, fixed linting, specific retry approach d68907b
• fix: fixed content-type case-sensitivity (closes #​1572) 44fadf9
• Add mention of bearer auth to docs (#​1583) e88a13f
• Update jQuery in tail.html (#​1582) a009ace
• Revert "Improve .retry() method functionality with delays and prevent calling on successful request (#​1527)" 74641bb
• fix: fixed lint, yarnlock 0c4f96f
• Improve .retry() method functionality with delays and prevent calling on successful request (#​1527) 62eae78
• fix: fixed travis f8ea331
• removed extra should from test description (#​1581) cc34638

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[codecov]

Codecov Report

Merging #69 (c3011f4) into master (aaf3639) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #69   +/-   ##
=======================================
  Coverage   86.38%   86.38%           
=======================================
  Files           6        6           
  Lines         191      191           
  Branches       26       26           
=======================================
  Hits          165      165           
  Misses         19       19           
  Partials        7        7           

Flag	Coverage Δ
alpine	86.38% <ø> (ø)
linux	86.38% <ø> (ø)
macos	86.38% <ø> (ø)

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