Support coverage 7.0

[agronholm]

For some reason, coveralls has an upper boundary that prevents it from installing together with coverage 7.0.0. Could this restriction be removed?

[agronholm]

The reason for this request is that currently pip install coverage[toml] coveralls results in coveralls 1.8.0 being installed which fails due to compatibility issues.

[ya-pekatoros]

Upd. Also gain that fil when tryed to install it.

[LincolnPuzey]

To use coverage 7.0, a workaround I found was to swap from this library to the coveralls.io-maintained github action:

• https://docs.coveralls.io/integrations#official-integrations
• https://github.com/marketplace/actions/coveralls-github-action

Though I don't think the action natively supports reading from .coverage files, so I had to add an extra step to my CI to generate coverage.xml then tell the action to upload that file: romgar/django-dirtyfields@572823e

[agronholm]

Unfortunately that doesn't seem to work on macOS runners: