Bump aiohttp from 3.7.4.post0 to 3.8.0 (#69)

Bumps [aiohttp](https://github.com/aio-libs/aiohttp) from 3.7.4.post0 to 3.8.0.
- [Release notes](https://github.com/aio-libs/aiohttp/releases)
- [Changelog](https://github.com/aio-libs/aiohttp/blob/master/CHANGES.rst)
- [Commits](aio-libs/aiohttp@v3.7.4.post0...v3.8.0)

---
updated-dependencies:
- dependency-name: aiohttp
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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