[chore] Change 'a11y' to 'accessibility' in README.md
[chore] Change 'a11y' to 'accessibility' in README.md

diasbruno/react-modal,bluSCALE4/react-modal,reactjs/react-modal,rackt/react-modal,springload/react-modal,reactjs/react-modal,bluSCALE4/react-modal,rackt/react-modal,diasbruno/react-modal,springload/react-modal,bluSCALE4/react-modal,diasbruno/react-modal,springload/react-modal,reactjs/react-modal