added node modules back to the example bot, so it exports with the required modules

node_modules/util/support/isBufferBrowser.js

@@ -0,0 +1,6 @@
+module.exports = function isBuffer(arg) {
+  return arg && typeof arg === 'object'
+    && typeof arg.copy === 'function'
+    && typeof arg.fill === 'function'
+    && typeof arg.readUInt8 === 'function';
+}