v16.6.1

• Update dependencies and bumped react to 16.6.1.
• Added a warning when react and react-konva versions don't match.
• Added special property _useStrictMode to all nodes. So you can use strict mode with only one component and keep global strict mode on its default value (false). Example <Rect _useStrictMode />
• reference to <Stage> component will return real Konva.Stage and not just react wrapper. Old code like this.stageRef.getStage() will still work.