flutter_timeline_v2 4.0.1

Updated flutter timeline package

4.0.0

I'm starting at version 4.0.0, because the flutter_timeline package stopped supporting at 3.0.0

I'm only trying to update the package, so that the community can keep using it's functionalities.

4.0.1

4.0.0 didn't work for some reason, so here to hope this works.