uses prop-types package to be compatible with React 15.5+

package.json

@@ -73,6 +73,7 @@
     "eslint-plugin-jsx-a11y": "^4.0.0",
     "eslint-plugin-react": "^6.10.3",
     "jest": "^19.0.2",
+    "prop-types": "^15.5.10",
     "react": "^15.4.2",
     "react-addons-test-utils": "^15.4.2",
     "react-dom": "^15.4.2",

src/Accordion/accordion.js

@@ -1,4 +1,5 @@
-import React, { Component, PropTypes } from 'react';
+import PropTypes from 'prop-types';
+import React, { Component } from 'react';
 
 const defaultProps = {
     accordion: true,

src/AccordionItem/accordion-item.js

@@ -1,4 +1,5 @@
-import React, { Component, PropTypes } from 'react';
+import PropTypes from 'prop-types';
+import React, { Component } from 'react';
 import uuid from 'uuid';
 
 const defaultProps = {

src/AccordionItemBody/accordion-item-body.js

@@ -1,4 +1,5 @@
-import React, { PropTypes } from 'react';
+import PropTypes from 'prop-types';
+import React from 'react';
 import classNames from 'classnames';
 
 const defaultProps = {

src/AccordionItemTitle/accordion-item-title.js

@@ -1,4 +1,5 @@
-import React, { Component, PropTypes } from 'react';
+import PropTypes from 'prop-types';
+import React, { Component } from 'react';
 
 const defaultProps = {
     id: '',