v3.1.0

• add a container prop

Usage:

// If you want to render the portal inside your own container
const container = document.getElementById('my-custom-container-id');

export default class App extends React.Component {
  render() {
    return (
      <Modal container={container}>
        <p>I am in my-custom-container-id.</p>
      </Modal>
    );
  }
}