Update badge, works for django 2.x

README.md

-# hshassets [![python version](https://img.shields.io/badge/python-3.x-blue.svg)]() [![django version](https://img.shields.io/badge/Django-1.11.x-yellow.svg)]()
+# hshassets [![python version](https://img.shields.io/badge/python-3.x-blue.svg)]() [![django version](https://img.shields.io/badge/Django-2.x-green.svg)]()
 
 This django-app provides everything you ever wanted! (probably not, but i hope you feel happy anyways). It brings fonts,
 styles, javascript and layouts as templates.