feat(cubit)!: ignore duplicate states (felangel#16)

feat(cubit): allow initialState to be null (felangel#15)

feat(cubit_test)!: upgrade to cubit ^0.0.6 (felangel#17)

refactor!: make cubit initial state a named parameter (felangel#13)

feat!(cubit_test): upgrade to cubit v0.0.4

fix(cubit_test): flutter stable compat by using test ^0.14.0

docs(cubit_test): improve wording

fix: expose CubitListenerSingleChildWidget and CubitProviderSingleChi…

…ldWidget

fix: hide CubitSingleChildWidgets and handle ProviderNotFoundException (

felangel#9)

* fix: hide CubitListenerSingleChildWidget and CubitProviderSingleChildWidget
* fix: `ProviderNotFoundException` handling and do not leak `Provider` implementation

feat: CubitConsumer, MultiCubitListener, and MultiCubitProvider (fela…

…ngel#8)