add state() method to get current state (#25)

Fix a bug on action stream

Add public initializer in VoidAction

Handle errors on await reducers (#24)

- await manner로 async reducer를 실행했을 때 오류가 발생하면 on(error:)가 호출되지 않는 문제점을 수정함.

Support copy method to state (#23)

* support copy method-to-state
* Update podspec

add @discardableResult to setState and withState

fix errors

Merge pull request #21 from ReactComponentKit/feature/apply-deep-diff…

…-2.2.0

apply DeepDiff 2.2.0

Merge pull request #20 from ReactComponentKit/features/apply-output-type

apply output type

specify swfit version