Bump superagent from 3.8.2 to 3.8.3

[dependabot-preview]

Bumps superagent from 3.8.2 to 3.8.3.

Release notes

Sourced from superagent's releases.

v3.8.3

• Add flags for 201 & 422 responses (Nikhil Fadnis)
• Emit progress event while uploading Node Buffer via send method (Sergey Akhalkov)
• Fixed setting correct cookies for redirects (Damien Clark)
• Replace .catch with ['catch'] for IE9 Support (Miguel Stevens)

Changelog

Sourced from superagent's changelog.

3.8.3 (2018-04-29)

• Add flags for 201 & 422 responses (Nikhil Fadnis)
• Emit progress event while uploading Node Buffer via send method (Sergey Akhalkov)
• Fixed setting correct cookies for redirects (Damien Clark)
• Replace .catch with ['catch'] for IE9 Support (Miguel Stevens)

Commits

• 295dfcd Bump
• c2f65c6 Lock marked version due to bug
• 75d1ca0 Fix #1366 docs
• bf1a87a Merge pull request #1360 from itsfadnis/flags_for_201_and_422
• 386f702 Add flags for 201 & 422 responses
• d70933c Make GitHub happy
• b176c0e Be super clear piping in superagent breaks everything else
• 336b51e Merge pull request #1351 from jedwards1211/patch-2
• 038bd46 file => field
• a6fc595 typo fix
• Additional commits viewable in compare view

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[codecov]

Codecov Report

Merging #19 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master     #19   +/-   ##
======================================
  Coverage    6.05%   6.05%           
======================================
  Files          96      96           
  Lines        2164    2164           
======================================
  Hits          131     131           
  Misses       2033    2033

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[dependabot-preview]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.