[PR] Update redux.md
[PR] Update redux.md

Summary:
getState should return the State, not just a generic Object
Closes https://github.com/facebook/flow/pull/3953

Reviewed By: gabelevi

Differential Revision: D5079655

Pulled By: mroch

fbshipit-source-id: ed3dea2a9e3a0684c58399d07b0856360bbe7f19

TiddoLangerak/flow,fletcherw/flow,MichaelDeBoey/flow,gabelevi/flow,mroch/flow,jamesgpearce/flow,TiddoLangerak/flow,mroch/flow,JonathanUsername/flow,jamesgpearce/flow,jamesgpearce/flow,fletcherw/flow,ylu1317/flow,fletcherw/flow,samwgoldman/flow,TiddoLangerak/flow,JonathanUsername/flow,facebook/flow,ylu1317/flow,samwgoldman/flow,nmote/flow,mroch/flow,claudiopro/flow,AgentME/flow,ylu1317/flow,fletcherw/flow,jamesgpearce/flow,mroch/flow,MichaelDeBoey/flow,nmote/flow,mroch/flow,JonathanUsername/flow,gabelevi/flow,samwgoldman/flow,facebook/flow,nmote/flow,mroch/flow,gabelevi/flow,MichaelDeBoey/flow,facebook/flow,jamesgpearce/flow,gabelevi/flow,facebook/flow,nmote/flow,fletcherw/flow,MichaelDeBoey/flow,popham/flow,facebook/flow,jamesgpearce/flow,JonathanUsername/flow,claudiopro/flow,popham/flow,ylu1317/flow,samwgoldman/flow,AgentME/flow,popham/flow,ylu1317/flow,samwgoldman/flow,gabelevi/flow,popham/flow,claudiopro/flow,popham/flow,facebook/flow,samwgoldman/flow,AgentME/flow,nmote/flow,mroch/flow,samwgoldman/flow,gabelevi/flow,TiddoLangerak/flow,fletcherw/flow,JonathanUsername/flow,popham/flow,MichaelDeBoey/flow,claudiopro/flow,AgentME/flow,claudiopro/flow,nmote/flow,facebook/flow,popham/flow,JonathanUsername/flow,TiddoLangerak/flow,gabelevi/flow,nmote/flow,JonathanUsername/flow,jamesgpearce/flow,AgentME/flow