schemaVersion property Null safety

1. conduit_core
2. conduit
3. PersistentStore
4. schemaVersion property

PersistentStore class

1. Constructors
2. PersistentStore
3. Properties
4. hashCode
5. runtimeType
6. schemaVersion
7. Methods
8. addColumn
9. addIndexToColumn
10. addTableUniqueColumnSet
11. alterColumnDefaultValue
12. alterColumnDeleteRule
13. alterColumnNullability
14. alterColumnUniqueness
15. close
16. createTable
17. deleteColumn
18. deleteIndexFromColumn
19. deleteTable
20. deleteTableUniqueColumnSet
21. execute
22. executeQuery
23. newQuery
24. noSuchMethod
25. renameColumn
26. renameIndex
27. renameTable
28. toString
29. transaction
30. upgrade
31. Operators
32. operator ==