update readme (#10)

Co-authored-by: Ran Isenberg <ran.isenberg@cyberark.com>

Author: ran-isenberg

README.md

@@ -44,7 +44,7 @@ This repository is the complementary code examples of my blog series "AWS Lambda
 ## The Blog Series
 - First blog post - Logging:  https://www.ranthebuilder.cloud/post/aws-lambda-cookbook-elevate-your-handler-s-code-part-1-logging
 - Second blog post- Observability: Monitoring and Tracing: https://www.ranthebuilder.cloud/post/aws-lambda-cookbook-elevate-your-handler-s-code-part-2-observability
-- Third blog post- Observability: Business KPIs Metrics: https://isenberg-ran.medium.com/aws-lambda-cookbook-elevate-your-handlers-code-part-2-observability-eff158307180
+- Third blog post- Observability: Business KPIs Metrics: https://www.ranthebuilder.cloud/post/aws-lambda-cookbook-elevate-your-handler-s-code-part-3-business-domain-observability
 
 
 ## Getting started