message: Fix transitions example for static pickers
diff: import React, { PureComponent } from 'react';
  +import Paper from '@material-ui/core/Paper';
  import BasePicker from 'material-ui-pickers/_shared/BasePicker';
  import Calendar from 'material-ui-pickers/DatePicker/Calendar';
  import TimePickerView from 'material-ui-pickers/TimePicker/TimePickerView';
  @@ -31,8 +32,11 @@ class StaticPickers extends PureComponent {
  }) => (
  <div>
  <div className="picker">
  + <Paper style={{ overflow: 'hidden' }}>
  <Calendar date={date} onChange={handleChange} />
  + </Paper>
  </div>
  +
  <TimePickerView
  date={date}
  ampm={false}
  