Added link to official Ubuntu MAAS website

Added link to official Ubuntu MAAS website in the 'Read more' section of README.rst.
diff --git a/README.rst b/README.rst
index 3865db8..26cd653 100644
--- a/README.rst
+++ b/README.rst
@@ -207,7 +207,7 @@
 Read more
 =========
 
-* 
+* https://maas.io/
 
 Documentation and Bugs
 ======================