README.md in keen-0.9.8 vs README.md in keen-0.9.9

- old
+ new
@@ -410,9 +410,12 @@
 
 If you want some bot protection, check out the [Voight-Kampff](https://github.com/biola/Voight-Kampff) gem. Use the gem's `request.bot?` method to detect bots and avoid logging events.
 
 ### Changelog
 
+##### 0.9.9
++ Added the ability to send additional optional headers.
+
 ##### 0.9.7
 + Added a new header `Keen-Sdk` that sends the SDK version information on all requests.
 
 ##### 0.9.6
 + Updated behavior of saved queries to allow fetching results using the READ KEY as opposed to requiring the MASTER KEY, making the gem consistent with https://keen.io/docs/api/#getting-saved-query-results 