Merge pull request #56 from TLuthra/add-collab-role-event

Added COLLAB_ROLE_CHANGE

Author: gcurtis

src/main/java/com/box/sdk/BoxEvent.java

@@ -159,6 +159,11 @@ public enum Type {
          */
         COLLAB_INVITE_COLLABORATOR,
 
+        /**
+         * A collaborator's role was change in a folder.
+         */
+        COLLAB_ROLE_CHANGE,
+
         /**
          * A folder was marked for sync.
          */