Update superagent to version 1.5.0 🚀

[greenkeeperio-bot]

Hello :wave:

:rocket::rocket::rocket:

superagent just published its new version 1.5.0, 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 37 commits .

• 910cfee v1.5.0
• c201b0d Bump version
• 5605cba Updated changelog
• 927a21f Merge pull request #798 from leonli/master
• 7c5fff1 Merge pull request #795 from focusaurus/doc-fix-req.send
• 7abda78 correct 'emit' typo
• 454eeb2 Avoid the error which is omitted from 'socket hang up'
• 319b72a Merge pull request #758 from vadimgoncharov/issue-632
• 5683038 Add "POST with no data" test. Issue #632
• 420056e Merge pull request #743 from aaroncrows/add-delete-verb-support
• 5c5f847 Merge pull request #723 from reinaldo13/issue-705
• 2515f39 fix syntax in req.send API docs
• 0131d56 Merge pull request #791 from visionmedia/fix-790
• e3e37f7 Use weirder port to avoid 8888 collision
• 0eb2580 Merge pull request #788 from olalonde/travis

There are 37 commits in total. See the full diff.

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