Updated function hyperlink

deltanode · web-flow · commit 79b3ffb0e291 · 2021-08-30T17:13:46.000+05:30
diff --git a/README.md b/README.md
@@ -279,7 +279,7 @@ Welcome to the exercises. This is where the magic happens!
  </blockquote>
 
 
-### [4. Functions]()
+### [4. Functions](04-functions)
 ### [5. Arrays]()
 
 <!-- Challenges --------------------  -->
