add free ebook notification

Author: Packt-ITService

README.md

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+### Get this product for $5
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+<i>Packt is having its biggest sale of the year. Get this eBook or any other book, video, or course that you like just for $5 each</i>
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+<b><p align='center'>[Buy now](https://packt.link/9781789612905)</p></b>
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+<b><p align='center'>[Buy similar titles for just $5](https://subscription.packtpub.com/search)</p></b>
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 # Mastering GUI Programming with Python
 
 <a href="https://www.packtpub.com/application-development/mastering-gui-programming-python"><img src="https://www.packtpub.com/media/catalog/product/cache/e4d64343b1bc593f1c5348fe05efa4a6/b/1/b12831.png" alt="Mastering GUI Programming with Python" height="256px" align="right"></a>