Update page 'Day 3 homework'

Day 3 homework.md

@@ -25,6 +25,7 @@ class BoundedInt():
 1. Read this: https://docs.python.org/3/reference/datamodel.html?highlight=__int__#object.__int__
 Modify the template to pass test 1, which checks that `int()` called on your class will return the value of `i`.
 2. Read this, and the paragraph below it: https://docs.python.org/3/reference/datamodel.html?highlight=__int__#object.__add__
+
 What do you think the types of x and y are?  Guess, without checking first.  What are they, actually?  You can use the debugger's local window to find out.
 Modify the template to pass test 2, which checks that:
     * Your class implements the + operator.