Update 4-defining-methods.md

"annual_interest": 0.0 > "annual_interest": 0.015
to be in line with the class example

Author: maratnugmanov

data/part-8/4-defining-methods.md

@@ -31,7 +31,7 @@ peters_account = BankAccount("12345-678", "Peter Python", 1500.0, 0.015)
 
 ```python
 # Example 2: bank account with dictionary
-peters_account = {"account_number": "12345-678", "owner": "Peter Python", "balance": 1500.0, "annual_interest": 0.0}
+peters_account = {"account_number": "12345-678", "owner": "Peter Python", "balance": 1500.0, "annual_interest": 0.015}
 ```
 
 With a dictionary the implementation is much shorter and more straightforward. With a class, however, the structure is more "tightly bound", so that we can expect all `BankAccount` objects to be structurally alike. A class is also named. The `BankAccount` class is referenced when creating a new bank account, and the type of the object is `BankAccount`, not `dict`.