Forward pipe to backend

Change-Id: Ia907f593d6ce4e329740c1e1a04c6eceaea92167
diff --git a/Changes b/Changes
index 7a5b276..fad80b6 100755
--- a/Changes
+++ b/Changes
@@ -1,8 +1,9 @@
-0.39 2020-06-30
+0.39 2020-07-02
         - Add information on secret file to Readme.
         - Change default API endpoint to korap.ids-mannheim.de.
         - Fix label for toggle plugins.
         - Activate plugin registry.
+        - Forward 'pipe' parameter to backend.
 
         WARNING: If you relied on the former default API endpoint
           being http://localhost:9999/, this will break your