message: use Typography for month name in CalendarHeader
diff: import React from 'react';
  import PropTypes from 'prop-types';
  -import { withStyles, IconButton } from 'material-ui';
  +import { withStyles, IconButton, Typography } from 'material-ui';
  import * as defaultUtils from '../utils/utils';
  export const CalendarHeader = (props) => {
  @@ -26,9 +26,9 @@ export const CalendarHeader = (props) => {
  {rtl ? rightArrowIcon : leftArrowIcon}
  </IconButton>
  - <div className={classes.monthName}>
  + <Typography type="subheading">
  {utils.getCalendarHeaderText(currentMonth)}
  - </div>
  + </Typography>
  <IconButton onClick={selectNextMonth}>
  {rtl ? leftArrowIcon : rightArrowIcon}
  @@ -79,9 +79,6 @@ const styles = theme => ({
  textAlign: 'center',
  color: theme.palette.text.hint,
  },
  - monthName: {
  - color: theme.palette.text.primary,
  - },
  });
  export default withStyles(
  