small fix for Birgit

Author: LisaBock

_episodes/07-development-setup.md

@@ -493,7 +493,7 @@ xdg-open doc/sphinx/build/index.html
 Congratulations! You are now ready to make a pull request. 
 
 However, we kindly ask that you hold 
-off for now if this would create additional workload for the ESMValTool Development Team. We 
+off for now since this would create (unnecessary) additional workload for the ESMValTool Development Team. We 
 appreciate your thoughtful consideration and look forward to receiving your personal contributions 
 in the future.