fix filename

README.md

@@ -38,4 +38,4 @@ Current Patterns:
 | [strategy](strategy.py) | selectable operations over the same data |
 | [template](template.py) | an object imposes a structure but takes pluggable components |
 | [visitor](visitor.py) | invoke a callback for all items of a collection |
-| [chaining_method](visitor.py) | continue callback next object method |
+| [chaining_method](chaining_method.py) | continue callback next object method |