fix is-a order in Prefer composition over inheritance description

Author: Liran Brimer

README.md

@@ -1582,7 +1582,7 @@ depends on your problem at hand, but this is a decent list of when inheritance
 makes more sense than composition:
 
 1. Your inheritance represents an "is-a" relationship and not a "has-a"
-relationship (Animal->Human vs. User->UserDetails).
+relationship (Human->Animal vs. User->UserDetails).
 2. You can reuse code from the base classes (Humans can move like all animals).
 3. You want to make global changes to derived classes by changing a base class.
 (Change the caloric expenditure of all animals when they move).