v5.0.0

Bump version to 5.0.0 for those who don't use custom .lints.json or .eslintrc.

Changes:

• Add stylelint
• Add linter names to the warning report
• Update ESLint linter: use "eslint:recommended" rules by default

If you already have a .lints.json, in order to use stylelint you
need to add it to your .lints.json, as in src/default.lints.json