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Animated circle with promise

Rewrite the showCircle function in the solution of the task Animated circle with callback so that it returns a promise instead of accepting a callback.

The new usage:

showCircle(150, 150, 100).then(div => {
  div.classList.add('message-ball');
  div.append("Hello, world!");
});

Take the solution of the task Animated circle with callback as the base.