Update superagent to the latest version 🚀

[greenkeeper]

The dependency superagent was updated from 3.8.3 to 4.0.0.

This version is not covered by your current version range.

If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update.

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Release Notes for v4 = ES6 natively

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.

Commits

The new version differs by 75 commits.

• e94bb10 Bump
• 4ef086e Better messaging around H2
• 7a6dc25 Bump
• 5e3632f Merge pull request #1414 from sogaani/http2-with-node10
• 575ca5e Add supporting HTTP/2 to Express
• dc5b04f Anytime close socket when call request.abort()
• 1d04d5d Fix http2 request with node 10.
• b08371c Drop HTTP/2, as it doesn't work in Node 10 any more
• 9c7a97e npm is annoying
• 5e757d1 Test H/2 only on Node 10
• 0b8b48f Lag
• ce41a40 Bump deps
• b54d3ae Lag-proof test
• 08a850d Fix deprecated
• 070a0a2 Bump

There are 75 commits in total.

See the full diff

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[greenkeeper]

• The dependency superagent was updated from 3.8.3 to 5.0.3.

Update to this version instead 🚀

Release Notes for v5.0.3

• 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...v5.0.3