Update README.md

Author: dbader

python-web-applications/README.md

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 # Python Web Applications: Deploy Your Script as a Flask App
 
-Code snippets supplementing the [Python Web Applications: Deploy Your Script as a Flask App](https://realpython.com/python-web-applications-update/) tutorial.
+Code snippets supplementing the [Python Web Applications: Deploy Your Script as a Flask App](https://realpython.com/python-web-applications/) tutorial.
 
 ## Running Locally