chore(examples): update react version

Author: STRML

examples/1.html

@@ -10,8 +10,8 @@
         padding-bottom: 250px;
       }
     </style>
-    <script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.6.1/react.min.js"></script>
-    <script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.6.1/react-dom.min.js"></script>
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.14.0/umd/react.development.min.js"></script>
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.14.0/umd/react-dom.development.min.js"></script>
     <script src="/bundle.js"></script>
     <title>React-Resizable</title>
   </head>