Update README.md

README.md

@@ -9,8 +9,9 @@ No application is perfect from the beginning. With over a dozen coming articles,
 1. [**Too modern Go application? Building a serverless application with Google Cloud Run and Firebase**](https://threedots.tech/post/serverless-cloud-run-firebase-modern-go-application/?utm_source=github.com)
 2. [**A complete Terraform setup of a serverless application on Google Cloud Run and Firebase**](https://threedots.tech/post/complete-setup-of-serverless-application/?utm_source=github.com)
 3. [**Robust gRPC communication on Google Cloud Run (but not only!)**](https://threedots.tech/post/robust-grpc-google-cloud-run/?utm_source=github.com)
-3. [**You should not build your own authentication. Let Firebase do it for you.**](https://threedots.tech/post/firebase-cloud-run-authentication/?utm_source=github.com)
-4. *More articles are on the way!*
+4. [**You should not build your own authentication. Let Firebase do it for you.**](https://threedots.tech/post/firebase-cloud-run-authentication/?utm_source=github.com)
+5.[**Business Applications in Go: Things to know about DRY**](https://threedots.tech/post/things-to-know-about-dry/?utm_source=github.com)
+6. *More articles are on the way!*
 
 ### Directories