pub.dev update please

[njuh0]

Update please your package in pub.dev with null safety and last changes

[wilin52]

Update please your package in pub.dev with null safety and last changes

I'll update soon

[njuh0]

Update please your package in pub.dev with null safety and last changes

I'll update soon

Also I noticed after my last pull request the tabs stopped changing by swipe (when tabs inside tabs). I don't know how to fix that issue