Refresh captcha

I add method to refresh captcha, it's easy to use like this : 

1) : Add button in your form, give it an ID
      Exemple : <button id="myRefreshBtn">Refresh</button>

2) In your JS file write the button ID
      Exemple: 	$('#myForm').motionCaptcha({
				btnRefresh: '#myRefreshBtn'
			});

And... That's all !
We can refresh your motionCaptcha !