code: public static ConfigDocument parseReader(Reader reader, ConfigParseOptions options) {
          return Parseable.newReader(reader, options).parseConfigDocument();
      }
docs: Parses a Reader into a ConfigDocument instance.
  
  @param reader
  the reader to parse
  @param options
  parse options to control how the reader is interpreted
  @return the parsed configuration
  @throws com.typesafe.config.ConfigException on IO or parse errors