message: Fix defaultProps on Sidebar
diff: @@ -2,6 +2,8 @@ import * as React from 'react';
  import * as PropTypes from 'prop-types';
  // @ts-ignore
  import _get from 'lodash/get';
  +// @ts-ignore
  +import _merge from 'lodash/merge';
  import { FlexProps as ReakitFlexProps } from 'reakit/ts';
  import { Omit } from '../types';
  @@ -38,7 +40,7 @@ export const PageWithSidebar: React.FunctionComponent<LocalPageWithSidebarProps>
  }) => {
  const defaultProps = _get(theme, 'fannypack.Page.WithSidebar.defaultProps', {});
  const hideSidebarOnDesktop = _hideSidebarOnDesktop || defaultProps.hideSidebarOnDesktop;
  - const sidebarProps = _sidebarProps || defaultProps.sidebarProps;
  + const sidebarProps = _merge(_sidebarProps, defaultProps.sidebarProps);
  const sidebarWidth = _sidebarWidth || defaultProps.sidebarWidth;
  return (
  <PageContainer>
  