image URL update in Readme

README.md

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 # Python Fundamentals LiveLessons
 This repository contains the source code and supporting files associated with our **_Python Fundamentals LiveLessons_** videos, which are based on our professional book <a href=https://amzn.to/2Kd8dQk target="_blank">_Python for Programmers_</a> and our textbook <a href=https://amzn.to/2KfCptN target="_blank">_Intro to Python for Computer Science and Data Science: Learning to Program with AI, Big Data and the Cloud_.</a>
 
-<img src="http://deitel.com/bookresources/PythonFP/PythonForProgrammersCover.png" alt="Cover image for Python for Programmers" width=300/>
+<img src="https://deitel.com/wp-content/uploads/2020/01/python-for-programmers.jpg" alt="Cover image for Python for Programmers" width=300/>
 
-<img src="http://deitel.com/bookresources/IntroToPython/IntroToPythonCover.png" alt="Cover image for Intro to Python for Computer Science and Data Science: Learning to Program with AI, Big Data and the Cloud" width=300/>
+<img src="https://deitel.com/wp-content/uploads/2020/01/intro-to-python-for-computer-science-and-data-science.jpg" alt="Cover image for Intro to Python for Computer Science and Data Science: Learning to Program with AI, Big Data and the Cloud" width=300/>
 
 These files are Copyright 2019 by Pearson Education, Inc. All Rights Reserved.