Update aiohttp to 3.5.4

[pyup-bot]

This PR updates aiohttp from 3.5.3 to 3.5.4.

The bot wasn't able to find a changelog for this release. Got an idea?

Links

• PyPI: https://pypi.org/project/aiohttp
• Changelog: https://pyup.io/changelogs/aiohttp/
• Repo: https://github.com/aio-libs/aiohttp

[codecov]

Codecov Report

Merging #19 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #19   +/-   ##
=======================================
  Coverage   61.22%   61.22%           
=======================================
  Files           3        3           
  Lines          49       49           
  Branches        3        3           
=======================================
  Hits           30       30           
  Misses         19       19

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update fdea290...e23f577. Read the comment docs.