v3.0.10

• add getOriginalWx and setOriginWx in client.js to get or set the original wx object to instance
• the instance will be passed to success and error callback as the last arg, since when people use the arrow function, this will be lost:

{
  success: w => {console.log(w.getOriginalWx())},
  error: (err, w) => {console.log(w.getOriginalWx())},
}

• demo updates to use getter above and other minor fixes