changed release notes

Author: Wolfgang-Schuetzelhofer

release_notes.md

@@ -4,7 +4,7 @@ Release Notes
 ## 3.9.0
 **New**
 - Support for Neo4J 3.3.1.
-- Set planner rule globally or individually on a per query basis.
+- Set planner strategy globally or individually on a per query basis.
 - New - ...SET(...).byExpression() - to allow formulating the expression in form of Clauses (e.g. CASE .. WHEN ..)
 
 ## 3.8.0