Update Feature-tour.md

[lukechi1219]

method name "interrupt" has changed to "abort"

and to us Optional named parameters, may should use {param1, param2, …}

eg: Future abort(int statusCode); become Future abort({int statusCode});

ref: https://github.com/redstone-dart/redstone/blob/v0.6/lib/src/request.dart https://github.com/redstone-dart/redstone/blob/v0.6/lib/src/router.dart

[Pacane]

Thanks a lot!