Update README.md

Author: dbader

serverless-sms-service/README.md

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 # Serverless SMS Sender Service
 
-This repository is linked to https://realpython.com/aws-lambda-serverless-python/ post.
+This repository is linked to https://realpython.com/aws-chalice-serverless-python/ post.
 
 A step by step tutorial on how to build and deploy your very first serverless app. Multiple steps are divided in 
 3 tags where each tag serves as an incremental feature. Let's begin by cloning the repository and follow the steps from the post.