Replace the example of the composite pattern

The previous example a little wordy. We can use less code to describe the composite pattern. Less code allows us to focus on the pattern self.

Author: toaco

README.md

@@ -28,7 +28,7 @@ __Structural Patterns__:
 |[3-tier](structural/3-tier.py)| data<->business logic<->presentation separation (strict relationships) |
 |[adapter](structural/adapter.py)| adapt one interface to another using a white-list |
 |[bridge](structural/bridge.py)| a client-provider middleman to soften interface changes |
-|[composite](structural/composite.py)|encapsulate and provide access to a number of different objects|
+|[composite](structural/composite.py)|lets clients treat individual objects and compositions uniformly|
 |[decorator](structural/decorator.py)| wrap functionality with other functionality in order to affect outputs |
 |[facade](structural/facade.py)| use one class as an API to a number of others |
 |[flyweight](structural/flyweight.py)| transparently reuse existing instances of objects with similar/identical state |