Update superagent to version 2.0.0 🚀

[greenkeeperio-bot]

Hello :wave:

:rocket::rocket::rocket:

superagent just published its new version 2.0.0, which is not covered by your current version range.

If this pull request passes your tests you can publish your software with the latest version of superagent – otherwise use this branch to work on adaptions and fixes.

Happy fixing and merging :palm_tree:

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The new version differs by 106 commits .

• fda9b5e v2.0.0
• 2429a1e 2.0.0-alpha.3
• 2ae9281 Catch errors thrown during end event
• 536e9a6 Merge pull request #989 from focusaurus/doc-electron-browser
• d0c57f1 document browser version in electron
• b3ef32c Merge pull request #981 from visionmedia/pipeevents
• b24ab0b Emit response event when piping
• 8ae7380 Exclude bower.json from npm to avoid generating a confusing package
• 6b0e527 Alpha 2
• b47a011 Backwards compatibility with superagent-mock
• 984fbc6 Merge remote-tracking branch 'origin/headredirects'
• d351b1c Skip redirect test that exposes bug in IE
• 94f6f0a Merge pull request #974 from visionmedia/formserialize
• 6ff9350 Browsers are broken
• 1d8dc66 Localtunnel timeouts

There are 106 commits in total. See the full diff.

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