Updated README to match new syntax

Author: Paolo Pustorino

README.markdown

@@ -12,14 +12,14 @@ Create a controller named at your wish, and add the following code to it:
 
     $myform->set_action('home')
     ->add_file_field('image','Upload image')
-    ->add_group('account')
+    ->add_fieldset('account')
       ->add_text_field('username', 'Username', 'trim|required|minlength[5]|xss_clean')
       ->add_password_field('password')
       ->add_email_field('email')
-    ->add_group('profile', 'Your Profile')
+    ->add_fieldset('profile', 'Your Profile')
       ->add_text_field('name', 'First Name')
       ->add_checkbox('happy', 'I am happy', 'yes', '', TRUE, array('class'=>'check happy', 'id'=>'mycheck'))
-    ->close_group()
+    ->close_fieldset()
     ->add_checkboxes('foos', 'Foos list', array(
       array (
         'label' => 'Foo 1',