py-aioresponses: updated to 0.7.4

0.7.4
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* bump py36 to ubuntu 20.04
* restore 3.6
* Adjust github actions test workflow
* Fix python versions in env list
* Add documentation for repeat argument
* Add compat module
* fix long line by adding line breaks
* shorten comment to obey line length limit
* split typing and assignment to avoid long line
* Avoid type confusion by explicitly typing as \`ClientResponse\`
* ignore false positive mypy warning when \`url\_or\_pattern\` is a \`Pattern\`
* add \`py.typed\` to MANIFEST.in
* add \`py.typed\` file to package data in setup.py
* fix version after release was tagged/released
* Extend  for arguments
* Init assert\_called
* Fix type annotations

(adam)