Fix minor typos in README.md
Fix minor typos in README.md

mikesea/react-rails,appslingr/react-lite-rails,appslingr/react-lite-rails,reactjs/react-rails,reactjs/react-rails,mikesea/react-rails,appslingr/react-lite-rails,reacuna/react-rails,mikesea/react-rails,reactjs/react-rails,reactjs/react-rails,reacuna/react-rails,reacuna/react-rails