Update README.md

Author: zhiwehu

README.md

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 100+ Python challenging programming exercises.
 
+<a href="https://tracking.gitads.io/?repo=Python-programming-exercises"><img src="https://images.gitads.io/Python-programming-exercises" alt="GitAds"/></a>
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 ## Python Comics
 
 Hey guys I just created a comic for learning Python if you like you could see it from here: https://aicodeplayer.com
 For now I just use Chinese if you like I could use English as well.
 
 ![Python Comic](https://github.com/zhiwehu/Python-programming-exercises/blob/master/comic.png?raw=true)
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-<a href='https://tracking.gitads.io/?repo=Python-programming-exercises'><img src="https://images.gitads.io/Python-programming-exercises" alt="git-ad"/></a>