Make URL mandatory for plugin registration (Close #573)

Change-Id: I7477eda28559274a4ee923cae092e7b5e380460e
diff --git a/Changes b/Changes
index cf7213f..a621898 100644
--- a/Changes
+++ b/Changes
@@ -1,6 +1,7 @@
 # version 0.76-SNAPSHOT
 
 - Add institution & landingPage to the resource web-service (#777)
+- Make URL mandatory for plugin registration (#573)
 
 # version 0.75