Add changelog for 2.8.0

Author: pieter-edelman-nictiz

generate/README.md

@@ -389,6 +389,9 @@ Because of the verbosity of the ANT build, the logging level is set to 1 (warnin
 
 ## Changelog
 
+### 2.8.0
+- Major internal rewrite to migrate functionality from ANT to XSLT, which is more powerful and maintainable. The functionality should be the same.
+
 ### 2.7.0
 - Add support for rule outputs using the `<nts:output>` tag within `<nts:rule>`. WARNING: the `<nts:param>` tag for rules is renamed to `<nts:parameter>` as well!