The bootlint codebase likely contains a function that inspects CSS or HTML URLs for Bootstrap versions. Locate the relevant file (e.g., in the `lib` or `src` directory) where URL patterns are matched. Add a check for '/v4 dev/' in the URL to classify it as Bootstrap v4. No existing PRs or comments provide additional context.
Detect /v4-dev/ in URLs as Bootstrap v4 · twbs/bootlint#337 | Good First Issue