v4.2.0

• #299 - legacy: use pretty message when validator used in schema doesn't exist
• #401 - typescript: set withMessage() arg type to any
• #406 - docs: fix req.asyncValidationErrors() return value description
• #410 - docs: don't show .throw() without try..catch
• #411 - check: make validationResult work even though no validators ran
• check: add sanitization chain methods
• filter: add standalone sanitization middleware
• Remove deprecation warnings from legacy APIs
• Update validator to v8.2.0