Update free-programming-books.md (#5171)

Updated the link for:
Free eBook - Hands-On Natural Language Processing with Python

free-programming-books.md

@@ -2384,7 +2384,7 @@ Kerridge (PDF) (email address *requested*, not required)
 * [Google's Python Class](https://developers.google.com/edu/python/) (2.4 - 2.x)
 * [Google's Python Style Guide](https://google.github.io/styleguide/pyguide.html)
 * [Hadoop with Python](https://www.oreilly.com/learning/hadoop-with-python) -  Zachary Radtka, Donald Miner
-* [Hands-On Natural Language Processing with Python](https://www.packtpub.com/free-ebooks/hands-natural-language-processing-python) - Rajesh Arumugam, Rajalingappaa Shanmugamani (Packt account *required*)
+* [Hands-On Natural Language Processing with Python](https://www.packtpub.com/free-ebook/hands-on-natural-language-processing-with-python/9781789139495) - Rajesh Arumugam, Rajalingappaa Shanmugamani (Packt account *required*)
 * [Hitchhiker's Guide to Python!](http://docs.python-guide.org/en/latest/) (2.6)
 * [How to Code in Python 3](https://assets.digitalocean.com/books/python/how-to-code-in-python.pdf) - Lisa Tagliaferri (PDF)
 * [How to Make Mistakes in Python](http://www.oreilly.com/programming/free/files/how-to-make-mistakes-in-python.pdf) - Mike Pirnat (PDF) (1st edition)