Reduce around 400kB in the transpiled code.

Author: lucas-issa

src/js/CheckboxTree.js

@@ -1,5 +1,5 @@
 import classNames from 'classnames';
-import { isEqual } from 'lodash';
+import isEqual from 'lodash/isEqual';
 import PropTypes from 'prop-types';
 import React from 'react';
 import shortid from 'shortid';