CHANGELOG in compo-0.5.0 vs CHANGELOG in compo-0.5.1

@@ -1,4 +1,7 @@
+0.5.1 (2014-07-10)
+  - Remove references to ‘ModelObject’, which is a leftover from previous code
+    of which compo was a part.
 0.5.0 (2014-07-10) ‘Brimble’
   - Implement a root finder, which has the ability to enumerate the entire path
     from a parent-tracking composite object up to its root.
   - Implement new method #on_node, which executes a block if, and only if, the
     object is an actual composite node (not a Parentless, etc.).