code: 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)
      }
    }
  }
docs: Parse a '+' redis simple string response but forward the offsets
  onto convertBufferRange to generate a string.
  @param {JavascriptRedisParser} parser
  @returns {undefined|string|Buffer}