fix changelog

CHANGELOG.md

@@ -4,6 +4,7 @@ Changelog
 * **2015-07-30**: implement options to enable/disable guessers, loaders and voters 
 * **2015-07-20**: Cleaned up the sitemap generation. If you used the unreleased version of 
   sitemaps, you will need to adjust your code. See https://github.com/symfony-cmf/SeoBundle/pull/225
+  Options are available to keep all or no voters|guessers|loaders enabled or enable them one by one by its service id.
 * **2015-02-24**: Configuration for content_key moved to content_listener section, and its now possible to disable
   The content listener by setting cmf_seo.content_listener.enabled: false
 * **2015-02-14**: Added sitemap generation