update readme

README.md

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 This is the Repository for the Udemy course - "Complete Python Bootcamp".
 
-You can purchase the course for $12 by clicking [here](https://www.udemy.com/complete-python-bootcamp/?couponCode=PYTHON12). 
+You can purchase the course at a 50% discount by clicking [here](https://www.udemy.com/complete-python-bootcamp/?couponCode=PYTHON15). 
 Purchasing the course grants access to all the screencast videos and the moderated discussion forums!
 
-**Note: These Notebooks are free and always will be, even if you don't subscribe to the course or request a refund.**
 
 In this repo you will find all the accompanying Jupyter (p.k.a. iPython) Notebooks for the course. For quicker view rendering and simpler downloading procedures, you can check out this repo using [NbViewer](http://nbviewer.ipython.org/github/jmportilla/Complete-Python-Bootcamp/tree/master/).
 
 
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 Then navigate to your desired lecture and enjoy! You can download the .ipynb files onto your own computer for convenience.
 
 Enjoy the course and thank you for enrolling!