Fix bootstrap version in the demo

RomanHotsiy · IvanGoncharov · commit daf3c79abcd7 · 2018-10-16T16:33:27.000+03:00
fixes #16, fixes #15
diff --git a/demo/index.html b/demo/index.html
@@ -33,7 +33,7 @@
     </style>
     <title> GraphQL Lodash by APIs.guru </title>
     <meta name="viewport" content="width=device-width, initial-scale=1">
-    <link rel="stylesheet" media="screen" href="//maxcdn.bootstrapcdn.com/bootstrap/latest/css/bootstrap.min.css">
+    <link rel="stylesheet" media="screen" href="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/css/bootstrap.min.css">
     <link href="bundle.css" rel="stylesheet">
   </head>
   <body>
