Update 'README.md'

README.md

@@ -89,4 +89,6 @@ public Book(String title, double price)
 * Exercise 2.18 Can you guess what types some of the Book class’s fields might be? Can you assume anything about the names of its fields?
 
 Work all Exercises from 2.19 to 2.58 that are NOT marked *Challenge exercise*.
-READ upto and INCLUDING section 2.15 of this chapter.
+READ upto and INCLUDING section 2.15 of this chapter.
+
+.