Update 2.9.0 release notes

Author: corneliouzbett

README.md

@@ -10,6 +10,7 @@
   * [Setting up and controlling logging](#setting-up-and-controlling-logging)
 - [Get in touch](#get-in-touch)
 - [Releases notes](#releases-notes)
+    + [Version 2.9.0](#version-290)
     + [Version 2.8.0](#version-280) 
     + [Version 2.7.0](#version-270)
     + [Version 2.6.0](#version-260)
@@ -209,6 +210,7 @@ See the [documentation on Initializer's logging properties](readme/rtprops.md#lo
 #### Version 2.9.0
 * Fix for InitializerSerializer to ensure compatibility with OpenMRS version 2.7.0+
 * Fix for processing attributes to ensure compatibility with OpenMRS version 2.7.0+
+* Fix collisions between unit tests
 
 #### Version 2.8.0
 * Ampath forms translation files will now generate checksums.