Update comments

Author: mdmintz

examples/boilerplates/base_test_case.py

@@ -3,6 +3,7 @@
 Define your customized library methods in a master class like this.
 Then have all your test classes inherit it.
 BaseTestCase will inherit SeleniumBase methods from BaseCase.
+With Python 3, simplify "super(...)" to super().setUp() and super().tearDown()
 '''
 
 from seleniumbase import BaseCase