Update koa to version 1.1.0 🚀

[greenkeeperio-bot]

Hello :wave:

:rocket::rocket::rocket:

koa just published its new version 1.1.0, 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 koa – 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 28 commits .

• af0ae08 1.1.0
• 0b1b49c use strict in all .js files
• f875eb0 Merge pull request #486 from tejasmanohar/app_silent
• 6c19c41 keep test env logging for backwards-compat
• 65cc864 Merge pull request #491 from tejasmanohar/remove_err_assignment
• e717733 no need to assign error in catch{}-able test
• 237e6c4 Merge pull request #490 from tejasmanohar/webchat_irc_link
• 65b59a9 Merge pull request #489 from tejasmanohar/blank_newline_at_top
• 10f9811 add a webchat freenode link to irc channel
• 5e21238 add newline to bottom of file where missing
• ea4754e ensure all JS files have blank newline at top
• c369b33 app.silent option to turn off err logging
• b2bcbce docs: add request.origin
• 1ed691d fix some test formatting
• 2359b6a Merge pull request #483 from squarejaw/test-coverage

There are 28 commits in total. See the full diff.

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