Update README.md

Author: alphasecio

README.md

@@ -1,6 +1,6 @@
 # nodejs
 A minimal Node.js web application.
 
-For a step-by-step guide to deploying on Railway, see [this](https://alphasec.io/how-to-deploy-a-nodejs-app-on-railway/) post, or click the button below.
+For a step-by-step guide to deploying on [Railway](https://railway.app/?referralCode=alphasec), see [this](https://alphasec.io/how-to-deploy-a-nodejs-app-on-railway/) post, or click the button below.
 
 [![Deploy on Railway](https://railway.app/button.svg)](https://railway.app/new/template/Abo1zu?referralCode=alphasec)