-Modified the bouncing animation

[bsantanas]

Great repo @codestergit, thanks!!

I wanted the alert to bounce more smoothly so I replaced the 3 step animation for a continuous one with bounce and let the OS take charge of the steps! Now looks a lot smoother. The damping and duration can be modified

NOTE: I'm new to forking/pulling requests and couldn't prevent my project files to be pushed as well :/

[codestergit]

@bsantanas Can you please update the PR.