physics property Null safety

1. flutter_json_widgets
2. widget
3. SingleChildScrollView
4. physics property

SingleChildScrollView class

1. Constructors
2. SingleChildScrollView
3. fromJson
4. Properties
5. child
6. clipBehavior
7. copyWith
8. hashCode
9. key
10. keyboardDismissBehavior
11. padding
12. physics
13. primary
14. restorationId
15. reverse
16. runtimeType
17. scrollDirection
18. Methods
19. map
20. mapOrNull
21. maybeMap
22. maybeWhen
23. noSuchMethod
24. toJson
25. toString
26. when
27. whenOrNull
28. Operators
29. operator ==