Fixed code in readme.
Fixed code in readme.

danschultz/react-dart,evanweible-wf/react-dart,danschultz/react-dart,trentgrover-wf/react-dart,evanweible-wf/react-dart,cleandart/react-dart,trentgrover-wf/react-dart,evanweible-wf/react-dart,astashov/react-dart,trentgrover-wf/react-dart,trentgrover-wf/react-dart,cleandart/react-dart,cleandart/react-dart,astashov/react-dart,danschultz/react-dart,astashov/react-dart,cleandart/react-dart,astashov/react-dart,evanweible-wf/react-dart,danschultz/react-dart