Fix prototype.py typo

change "as it make.." to "as it makes.."

Author: janetat

patterns/creational/prototype.py

@@ -4,7 +4,7 @@
 application. Instead of relying on subclasses it creates objects by
 copying a prototypical instance at run-time.
 
-This is useful as it make it easier to derive new kinds of objects,
+This is useful as it makes it easier to derive new kinds of objects,
 when instances of the class have only a few different combinations of
 state, and when instantiation is expensive.