Updates CHANGELOG

CHANGELOG.md

@@ -1,13 +1,15 @@
 Changelog
 =========
 
-### TBD
+### 1.9.0 Aug 30, 2020
   - Switched to Poetry (https://python-poetry.org/) + more cleanup
   - Switched to pytest and pytest-django
   - Drop support for pre-Django 1.10 style MIDDLEWARES
   - Switch to old style url to path in urls.py
   - Added Black and re-formatted and linted all the code
   - Added isort and sorted all imports
+  - Bugfix: Add rule in admin was throwing an exception
+  - Handling "unknown" values in X-Forwarded-For header; introduces IPRESTRICT_USE_PROXY_IF_UNKNOWN header
   - More cleanup
 
 ### 1.8.1 Aug 24, 2020