move Practical Django 2 book to 2.1 section

README.md

@@ -207,6 +207,7 @@
 * [REST APIs with Django: Build web APIs with Python and Django](https://restapiswithdjango.com/)
 * [Build Your First Website with Django 2.1](https://transactions.sendowl.com/stores/9897/130290)
 * [Develop a Real-Time Taxi App with Django Channels and Angular](https://testdriven.io/courses/real-time-app-with-django-channels-and-angular/?source=e4245ba649f3)
+* [Practical Django 2 and Channels 2](https://www.amazon.com/dp/1484240987/?tag=wsvincent-20)
 
 > Django 2.0
 
@@ -214,7 +215,6 @@
 * [Django Design Patterns and Best Practices](https://www.amazon.com/dp/1788831349/?tag=wsvincent-20)
 * [Building Django 2.0 Web Applications](https://www.amazon.com/dp/B079DW6TRJ/?tag=wsvincent-20)
 * [Django RESTful Web Services](https://www.amazon.com/dp/1788833929/?tag=wsvincent-20)
-* [Practical Django 2 and Channels 2](https://www.amazon.com/dp/1484240987/?tag=wsvincent-20)
 
 > Django 1.11