Add 2.9.0 to changelog

Author: pelme

docs/changelog.rst

@@ -1,9 +1,12 @@
 Changelog
 =========
 
-NEXT
+2.9.0
 -----
 
+2.9.0 focus on compatibility with Django 1.9 and master as well as pytest 2.8.1
+and Python 3.5
+
 Features
 ^^^^^^^^
 * `--fail-on-template-vars` - fail tests for invalid variables in templates.
@@ -24,7 +27,6 @@ Bug fixes
 
 Compatibility
 ^^^^^^^^^^^^^
-
 * Drop support for Django 1.3. While pytest-django supports a wide range of
   Django versions, extended for Django 1.3 was dropped in february 2013.