Bump aiohttp from 3.0.6 to 3.1.0

[dependabot-preview]

Bumps aiohttp from 3.0.6 to 3.1.0.

Changelog

Sourced from aiohttp's changelog.

3.0.9 (2018-03-14)

• Close a connection if an unexpected exception occurs while sending a request
  (#2827)

3.0.8 (2018-03-12)

• Use asyncio.current_task() on Python 3.7 (#2825)

3.0.7 (2018-03-08)

• Fix SSL proxy support by client. (#2810)
• Restore a imperative check in setup.py for python version. The check
  works in parallel to environment marker. As effect a error about unsupported
  Python versions is raised even on outdated systems with very old
  setuptools version installed. (#2813)

Commits

• 77623f8 Add an introcuctory to aiohttp 3.1 release
• ea8b87e Update changelog
• ab55fa1 Move 3.0 changelogs to history
• bea1dba Bump to 3.1.0
• 1cfa64f Update README and index.html to use app.add_routes
• 9dd9ecb Fix pull request template (#2866)
• 3ee8a5e Prevent wild assignment in DEBUG mode only (#2860)
• 037ccbc fileresponse content-range header (#2847)
• 5b2948a Create CODE_OF_CONDUCT.md
• 655867a Fix trailing dash in version number in docs. (#2864)
• Additional commits viewable in compare view

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