2.0.0

1. Full cancellation token support added.
2. Pipeline and pipelineBuilder now can be used without IServiceProvider (it possible if no one of registered middlewares uses IServiceProvider).
3. Some implementation details hidden, more unit tests and documentation added.
4. Now possible to use not only class as middleware context param.

1.1.0

1. More docs
2. Cancellation token support
3. PipelineBuilder.Build method
4. Additional behavior tests

1.0.0

reach unit test coverage to 100%