style: code formatting

Author: dancergraham

chapter03_decorator/readme.md

@@ -1,13 +1,15 @@
 # Chapter 3: Decorator design pattern
 
-> **Decorator**: Attach additional responsibilities to an object dynamically. Decorators provide a flexible alternative to subclassing for extending functionality.
+> **Decorator**: Attach additional responsibilities to an object dynamically. Decorators provide a flexible alternative
+> to subclassing for extending functionality.
 
-Not quite the same as python [decorator syntax](https://docs.python.org/3/reference/compound_stmts.html#grammar-token-decorators)
-as in python you call the _decorated function_ and the decorating function 
+Not quite the same as
+python [decorator syntax](https://docs.python.org/3/reference/compound_stmts.html#grammar-token-decorators)
+as in python you call the _decorated function_ and the decorating function
 is called first whereas the _decorating function_ must be called here.
 
-I subclass `ABC` and used the `@abstractmethod` decorator from the 
-`abc` module here but do not use any of this functionality - 
+I subclass `ABC` and used the `@abstractmethod` decorator from the
+`abc` module here but do not use any of this functionality -
 it just serves as documentation.
 
 ## Running the code