Fix the stupid update-notifier breaking change

Yay. :'(

[skip ci]

bin/nodemon.js

@@ -3,8 +3,9 @@
 var cli = require('../lib/cli'),
     nodemon = require('../lib/'),
     updateNotifier = require('update-notifier'),
+    pkg = require('../package.json'),
     // checks for available update and returns an instance
-    notifier = updateNotifier({ packagePath: '../package' });
+    notifier = updateNotifier({ pkg: pkg });
 
 if (notifier.update) {
   // notify using the built-in convenience method