when mouse up outside of element

[전용범]

sorry for bad english...

when I mouse down an element, wave appears
then drag out of element and mouseUp, the wave remains.

repeat this it will be darken.

[Rafael]

I know this is late but it can be fixed by adding the code below into the "Getting all the buttons" script
document.addEventListener('mouseup', function(){
ripple.upAction();
});