fix broken env-var broken link

README.md

@@ -298,7 +298,7 @@ my-system
 
 ### `📝 #updated`
 
-**TL;DR:** A flawless configuration setup should ensure (a) keys can be read from file AND from environment variable (b) secrets are kept outside committed code (c) config is hierarchical for easier findability (d) typing support (e) validation for failing fast (f) Specify default for each key. There are a few packages that can help tick most of those boxes like [convict](https://www.npmjs.com/package/convict), [env-var](env-var), [zod](https://github.com/colinhacks/zod), and others
+**TL;DR:** A flawless configuration setup should ensure (a) keys can be read from file AND from environment variable (b) secrets are kept outside committed code (c) config is hierarchical for easier findability (d) typing support (e) validation for failing fast (f) Specify default for each key. There are a few packages that can help tick most of those boxes like [convict](https://www.npmjs.com/package/convict), [env-var](https://github.com/evanshortiss/env-var), [zod](https://github.com/colinhacks/zod), and others
 
 **Otherwise:** Consider a mandatory environment variable that wasn't provided. The app starts successfully and serve requests, some information is already persisted to DB. Then, it's realized that without this mandatory key the request can't complete, leaving the app in a dirty state