Handles URL changes

routerMiddleware.js

export const routerMiddleware = history => () => next => action => {
	switch (action.type) {
		case PUSH:
			history.push(action.payload);
			break;
		case REPLACE:
			history.replace(action.payload);
			break;
		case GO:
			history.go(action.payload);
			break;
		case GO_BACK:
			history.goBack();
			break;
		case GO_FORWARD:
			history.goForward();
			break;
		default:
			return next(action);
	}
};