Update dependency superagent to v5

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
superagent	devDependencies	major	3.8.3 -> 5.1.0

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Release Notes

visionmedia/superagent

v5.1.0

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• Disable setting default user-agent (#​1495) e652b8c

v5.0.9

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• feat: added fast-safe-stringify instead of JSON.stringify (closes #​1464) 2e5d6fd

v5.0.8

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• fix: removed @​babel/transform-runtime (closes #​1494) 28e7101

v5.0.6

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• feat: bump deps, fixed lint issues a3f75ed
• fix: omit queries that are set to undefined (#​1486) 7942c2d

v5.0.5

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• fix: remove redundant defs, bump deps fcf6cff

v5.0.4

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• Invalid redirect in pipe (#​1471) 7d0ea4b
• docs: fixed missing polyfill 251a1cb
• fix: amilajack/eslint-plugin-compat#​224 2d81605

v5.0.3

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• fix: add browser compiled version to lib folder (#​1470) 14acecd
• Revert "Avoiding to set the "Content-Length" header for GET requests (#​1460)" (#​1477) fe8d902
• Avoiding to set the "Content-Length" header for GET requests (#​1460) 804c35c

v5.0.2

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• fix: fixed browser require for webpack (closes #​1474) ccc7f56

v4.1.0

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• .connect() IP/DNS override option (Kornel)
• .trustLocalhost() option for allowing broken HTTPS on localhost
• .abort() used with promises rejects the promise.

v4.0.0

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Breaking changes

• Node.js v4 has reached it's end of life, so we no longer support it. It's v6+ or later. We recommend Node.js 10.
• We now use ES6 in the browser code, too.
  • If you're using Browserify or Webpack to package code for Internet Explorer, you will also have to use Babel.
  • The pre-built node_modules/superagent.js is still ES5-compatible.
• .end(…) returns undefined instead of the request. If you need the request object after calling .end() (and you probably don't), save it in a variable and call request.end(…). Consider not using .end() at all, and migrating to promises by calling .then() instead.
• In Node, responses with unknown MIME type are buffered by default. To get old behavior, if you use custom unbuffered parsers, add .buffer(false) to requests or set superagent.buffer[yourMimeType] = false.
• Invalid uses of .pipe() throw.

Minor changes

• Throw if req.abort().end() is called
• Throw if using unsupported mix of send and field
• Reject .end() promise on all error events (Kornel Lesiński)
• Set https.servername from the Host header (Kornel Lesiński)
• Leave backticks unencoded in query strings where possible (Ethan Resnick)
• Update node-mime to 2.x (Alexey Kucherenko)
• Allow default buffer settings based on response-type (shrey)
• response.buffered is more accurate.

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