Example easing function for default animation 'defaultAnimation'

[Raphaël Castello]

Hello and thank you for this excellent js library!

This is not an issue, I just want to expose here how I adjusted the easing because I have searched a bit, maybe this example could be part of the documentation.
This is how to set the 'defaultAnimation' object:

• First define an easing function as found here: easings.net (click on a function to preview the function)
  ex. :

var easeOutCubic = (x)=>{
    return 1 - Math. pow(1 - x, 3);
}

• Then define the object like this:

defaultAnimation: { 
    duration: 1200, // animation duration
    easing: easeInOutBack, // function that you defined before
},

I hope this helps others like me.
regards !