v1.15.1

• 🐥 expands the group matching introduced in v1.15.0 to more than one group (e.g. in "([^\\.])/(.+)$" stuff before the slash is available in $1, after the slash in $2 - and the whole match is available in $0.
• 📖 splits the rules documentation in a tutorial and a reference.
• 📖 expands documentation on group matching with the expansion to > 1 group.
• ⬆️ upgrades ajv (json schema validator) and eslint