Fix jQuery selector with context param order

`$(selector, parent)`

See: http://api.jquery.com/jQuery/#jQuery-selector-context

Author: jdhartley

README.md

@@ -1343,7 +1343,7 @@
 
     ```javascript
     // bad
-    $('.sidebar', 'ul').hide();
+    $('ul', '.sidebar').hide();
 
     // bad
     $('.sidebar').find('ul').hide();