function parseSimpleString (parser) {
  const start = parser.offset;
  const buffer = parser.buffer;
  const length = buffer.length - 1;
  var offset = start;

  while (offset < length) {
    if (buffer[offset++] === 13) { // \r\n
      parser.offset = offset + 1;
      if (parser.optionReturnBuffers === true) {
        return parser.buffer.slice(start, offset - 1)
      }
      return parser.buffer.toString('utf8', start, offset - 1)
    }
  }
}
Parse a '+' redis simple string response but forward the offsets
onto convertBufferRange to generate a string.
@param {JavascriptRedisParser} parser
@returns {undefined|string|Buffer}