Should release a new major version along with semver

[1000ch]

v2.4.0 includes stylelint's major version update includes breaking change.

If a project depends stylelint-config-fresh v2.3.0, conflict will occur by installing v2.4.0 automatically (Because stylelint-config-fresh v2.4.0 requires stylelint v9.0.0). So current master should be re-published as v3.0.0 along with semver.

[1000ch]

1. Revert stylelint major update (v9.x -> v8.x)
2. Release a patch version for stylelint-config-fresh (maybe v2.4.1)
3. Re-upgrade stylelint to v9.x.
4. Release a major version for stylelint-config-fresh (maybe v3.0.0)