Applied-Deep-Learning-with-Python Keras test is identical to python 3 test

[rioj7]

In
Applied-Deep-Learning-with-Python/Chapter-4/activity_1/test_stack.py

Keras is not tested. The test checks if Python 3.x is installed.

The python test should check for >= 3.5.

The final message is also incorrect because the script is used in Chapter 4.
Don't mention the chapter number

---

** Please review software requirements before
** proceeding to Lesson 2.

---