1.1.0

• Bumped mdn-data to 2.0.14
• Extended fork() method to allow append syntax instead of overriding for types, properties and atrules, e.g. csstree.fork({ types: { color: '| foo | bar' } })
• Extended lexer API for validation
  • Added Lexer#checkAtruleName(atruleName), Lexer#checkAtrulePrelude(atruleName, prelude), Lexer#checkAtruleDescriptorName(atruleName, descriptorName) and Lexer#checkPropertyName(propertyName)
  • Added Lexer#getAtrule(atruleName, fallbackBasename) method
  • Extended Lexer#getAtrulePrelude() and Lexer#getProperty() methods to take fallbackBasename parameter
  • Improved SyntaxMatchError location details
  • Changed error messages