v4.0.0

BREAKING CHANGE

Refactored the signatures of overrideDone, overrideNext, overrideSkip, and overrideBack parameters to provide improved onPressed handling and greater flexibility for custom button actions.

More information PR#234

• Add custom semantic label for progress PR#235
• Update readme PR#228
• Fix WASM support (using fork of flutter_keyboard_visibility) PR#232
• Allow to display back button on first page PR#233