Add ability for suffix textOverflow

[sabifa]

Thanks for your package, I really like it so far.
One thing that is missing for my usecase is the ability to specify a textOverflow for the suffix (e.g. ellipsis).

I've created a PR that adds this functionality. What are your thoughts on this?

[sabifa]

Another possibility would be to change the type of suffix / prefix to Widget instead of String. This way I could pass my adapted overflowable text widget into the widget like so instead of adding the suffixOverflow param.

AnimatedFlipCounter(
  duration: Duration(milliseconds: 500),
  value: _value,
  suffix: Flexible(
    child: Text(
      'my long text that is currently overflowing',
      overflow: TextOverflow.ellipsis,
    ),
  )
)

This would produce a breaking change though.

[Muhammarizo]

I have the same problem.