[fixed] ignore .babelrc when publishing to npm.
[fixed] ignore .babelrc when publishing to npm.

closes #569.

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