Update installation.rst

Author: juanifioren

docs/sections/installation.rst

@@ -7,7 +7,7 @@ Requirements
 ============
 
 * Python: ``2.7`` ``3.4`` ``3.5`` ``3.6``
-* Django: ``1.8`` ``1.9`` ``1.10`` ``1.11`` ``2.0``
+* Django: ``1.11`` ``2.0`` ``2.1``
 
 Quick Installation
 ==================