Bump aiofiles from 0.7.0 to 0.8.0 (#193)

Bump aiofiles from 0.7.0 to 0.8.0 (#193)

Bumps [aiofiles](https://github.com/Tinche/aiofiles) from 0.7.0 to 0.8.0.
- [Release notes](https://github.com/Tinche/aiofiles/releases)
- [Commits](https://github.com/Tinche/aiofiles/compare/v0.7.0...v0.8.0)

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

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