add $5 campaign

Author: Packt-ITService

README.md

@@ -1,3 +1,8 @@
+## $5 Tech Unlocked 2021!
+[Buy and download this Book for only $5 on PacktPub.com](https://www.packtpub.com/product/hands-on-javascript-for-python-developers/9781838648121)
+-----
+*If you have read this book, please leave a review on [Amazon.com](https://www.amazon.com/gp/product/1838648127).     Potential readers can then use your unbiased opinion to help them make purchase decisions. Thank you. The $5 campaign         runs from __December 15th 2020__ to __January 13th 2021.__*
+
 # Hands-on JavaScript for Python Developers
 
 <a href="https://www.packtpub.com/product/hands-on-javascript-for-python-developers/9781838648121?utm_source=github&utm_medium=repository&utm_campaign=9781838648121"><img src="https://packt-type-cloud.s3.amazonaws.com/uploads/sites/3634/2020/09/Cover.png" alt="Hands-on JavaScript for Python Developers" height="256px" align="right"></a>