Update dependency superagent to v3 - abandoned

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This PR contains the following updates:

Package	Type	Update	Change
superagent	dependencies	major	1.8.4 -> 3.0.0

By merging this PR, the below issues will be automatically resolved and closed:

Severity	CVSS Score	CVE	GitHub Issue
High	7.8	CVE-2021-43138	#209
High	7.5	CVE-2017-1000048	#79

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Release Notes

visionmedia/superagent

v3.0.0

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• Dropped support for Node 0.x. Please upgrade to at least Node 4.
• Dropped support for componentjs (Damien Caselli)
• Removed deprecated .part()/superagent.Part APIs.
• Removed unreliable .body property on internal response object used by unbuffered parsers.
  Note: the normal response.body is unaffected.
• Multiple .send() calls mixing Buffer/Blob and JSON data are not possible and will now throw instead of messing up the data.
• Improved .send() data object type check (Fernando Mendes)
• Added common prototype for Node and browser versions (Andreas Helmberger)
• Added http+unix: schema to support Unix sockets (Yuki KAN)
• Added full attach options parameter in the Node version (Lapo Luchini)
• Added pfx TLS option with new pfx() method. (Reid Burke)
• Internally changed .on to .once to prevent possible memory leaks (Matt Blair)
• Made all errors reported as an event (Kornel Lesiński)

v2.3.0

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• Enabled .field() to handle objects (Affan Shahid)
• Added authentication with client certificates (terusus)
• Added .catch() for more Promise-like interface (Maxim Samoilov, Kornel Lesiński)
• Silenced errors from incomplete gzip streams for compatibility with web browsers (Kornel Lesiński)
• Fixed event.direction in uploads (Kornel Lesiński)
• Fixed returned value of overwritten response object's on() method (Juan Dopazo)

v2.2.0

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• Added timedout property to node Request instance (Alexander Pope)
• Unified null querystring values in node and browser environments. (George Chung)

v2.1.0

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• Refactored async parsers. Now the end callback waits for async parsers to finish (Kornel Lesiński)
• Errors thrown in .end() callback don't cause the callback to be called twice (Kornel Lesiński)
• Added headers to toJSON() (Tao)

v2.0.0

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Breaking changes

Breaking changes are in rarely used functionality, so we hope upgrade will be smooth for most users.

• Browser: The .parse() method has been renamed to .serialize() for consistency with NodeJS version.
• Browser: Query string keys without a value used to be parsed as 'undefined', now their value is '' (empty string) (shura, Kornel Lesiński).
• NodeJS: The redirect event is called after new query string and headers have been set and is allowed to override the request URL (Kornel Lesiński)
• .then() returns a real Promise. Note that use of superagent with promises now requires a global Promise object.
  If you target Internet Explorer or Node 0.10, you'll need require('es6-promise').polyfill() or similar.
• Upgraded all dependencies (Peter Lyons)
• Renamed properties documented as @api private to have _prefixed names (Kornel Lesiński)

Probably not breaking changes:

• Extracted common functions to request-base (Peter Lyons)
• Fixed race condition in pipe tests (Peter Lyons)
• Handle FormData error events (scriptype)
• Fixed wrong jsdoc of Request#attach (George Chung)
• Updated and improved tests (Peter Lyons)
• request.head() supports .redirects(5) call (Kornel Lesiński)
• response event is also emitted when using .pipe()

v1.8.5

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