updated readme and written book.py class

Nisanur Bulut · Nisanur Bulut · commit 5c45b3558b91 · 2022-01-30T19:30:12.000+03:00
diff --git a/SayHiPython/Book.py b/SayHiPython/Book.py
@@ -4,7 +4,7 @@ def __init__(self, name, author, publish_date):
         self.author = author
         self.publish_date = publish_date
 
-    def change_publish_date(self, publish_date):
+    def change_publish_date(self, new_publish_date):
         self.publish_date = new_publish_date
 
     def change_name(self, new_name):
