added unicode in website_group generator

frappe/templates/generators/website_group.py

@@ -1,6 +1,8 @@
 # Copyright (c) 2013, Web Notes Technologies Pvt. Ltd. and Contributors
 # MIT License. See license.txt
 
+from __future__ import unicode_literals
+
 import frappe
 from frappe.website.permissions import get_access
 from frappe.website.render import can_cache