v0.3.1

[Change]Update R3 to v1.3.0
[Change]Validate IsValidationEnabled in CreateCanExecuteSource()
[Change]Renamed the parameter in the CreateCanExecuteSource() from forceInitialNotification to forceValidationOnStart.
[Change]Replace FluentAssertions with Shouldly

Full Changelog: v0.3.0...v0.3.1