use for of loop to refactor includes function. all tests pass after refactoring

Author: leigh-ross

Sprint-1/refactor/includes.js

@@ -1,12 +1,11 @@
 // Refactor the implementation of includes to use a for...of loop
 
 function includes(list, target) {
-  for (let index = 0; index < list.length; index++) {
-    const element = list[index];
-    if (element === target) {
+  for (item of list) {
+    if (target === item)
       return true;
     }
-  }
+  
   return false;
 }