Update CHANGELOG.

Author: neunhoef

CHANGELOG.md

@@ -1,8 +1,14 @@
 # ArangoDB Starter Changelog
 
-## Changes from version 0.13.8 to master
+## Changes from version 0.13.9 to master
+
+
+## Changes from version 0.13.8 to 0.13.9
 
 - Fix finding the storage engine if the master does not run a dbserver.
+- Fix --dbservers.* passthrough option for active-failover setup.
+- Polish documentation.
+- Fix tests by increasing a timeout.
 
 ## Changes from version 0.13.7 to 0.13.8