bug/loops2.cairo semicolumn added (#146)

There is a syntatic error in line 16 lacks of semicolumn so this is out of context problem must be fixed

exercises/loops/loops2.cairo

@@ -13,7 +13,7 @@ fn test_loop() {
     //TODO return a value from the loop
         }
         counter += 1;
-    }
+    };
 
     assert(result == 5, 'result should be 5');
 }