[Snyk] Upgrade superagent from 5.1.0 to 5.3.1

[snyk-bot]

Snyk has created this PR to upgrade superagent from 5.1.0 to 5.3.1.

:information_source: Keep your dependencies up-to-date. This makes it easier to fix existing vulnerabilities and to more quickly identify and fix newly disclosed vulnerabilities when they affect your project.

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• The recommended version is 9 versions ahead of your current version.
• The recommended version was released a year ago, on 2020-06-28.

Release notes

Package name: superagent

• 5.3.1 - 2020-06-28
  
  • Revert "fix: allow unset to prevent some defaults (#1560)" b411b66

  v5.3.0...v5.3.1

• 5.3.0 - 2020-06-28
  
  • chore: bump deps 5f7f7ff
  • fix: fixed package.json version per #1564 c067457
  • feature: Support port overrides in connect() (#1564) 7a25f3e
  • fix: ensure node retries happen when using .then syntax (#1487) (#1543) 77bcb11
  • fix: allow unset to prevent some defaults (#1560) afd20c1
  • fix: attach cookies to agent after plugin is used (#1556) 4babc5d
  • fix: a typo in docs (#1549) 5d729bb

  v5.2.2...v5.3.0

• 5.2.2 - 2020-02-17
  
  • Fix URI encoding (#1539) c7a10e2
  • Revert "feat: add secure cookie override to agent" (#1537) 40424e6
  • feat: add secure cookie override to agent (#1515) 737697f

  v5.2.1...v5.2.2

• 5.2.1 - 2020-01-07
  
  • fix: fixed .buffer prototype in client issue (closes #1517) 639ce2c

  v5.2.0...v5.2.1

• 5.2.0 - 2020-01-07
  
  • Check res.text as well to return a better error txt message (#1534) d957c81

  v5.1.4...v5.2.0

• 5.1.4 - 2020-01-07
  
  • fix: throw timeout error in promise interface when timedout (#1510) 56ce517

  v5.1.3...v5.1.4

• 5.1.3 - 2019-12-20
  
  • fix: fixed support for NODE_TLS_REJECT_UNAUTHORIZED (per #1511) 2377e62

  v5.1.2...v5.1.3

• 5.1.2 - 2019-12-01
  
  • fix: fixed linting, fixed deprecation warning in tests 7d70a75
  • Use res.getHeaders() to avoid deprecation warning (#1503) 8dc8b91

  v5.1.1...v5.1.2

• 5.1.1 - 2019-11-21
  

  5.1.1

• 5.1.0 - 2019-06-15
  
  • Disable setting default user-agent (#1495) e652b8c

  v5.0.9...v5.1.0

from superagent GitHub release notes

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