v1.8.0

• Merged from upstream, dropped support of Node.js 6, webpack 2 & 3.
  Strictly speaking, this is a breaking change, but I think it is a reasonable assumption that no actual user of this fork should have used it in these environments.
  So to avoid the burden of transitively updating all the dependents, I released it as minor.
  If you encountered any issues, please raise an issue on the GitHub repo.
• Supported eslint-webpack-plugin (#1)
• Respect CI env var and do not clear terminal (#2)
• Accept webpack 5 as a peer dependency