Requirement task 5

Holger Lösken · Holger Lösken · commit ed8ef8ff4e5e · 2021-03-11T21:44:02.000+01:00
diff --git a/README.md b/README.md
@@ -94,6 +94,7 @@ and return the last `6` non-zero numbers.
 
 **Requirements:**
 
+- Use a recursive approach instead of looping through.
 - Throw an exception when passing in a negative number
 
 **Example:**
