chore: Update quiz1.rs add explicit test for 40

Author: maartentibau

exercises/quiz1.rs

@@ -16,8 +16,10 @@
 #[test]
 fn verify_test() {
     let price1 = calculate_apple_price(35);
-    let price2 = calculate_apple_price(65);
+    let price2 = calculate_apple_price(40);
+    let price3 = calculate_apple_price(65);
 
     assert_eq!(70, price1);
-    assert_eq!(65, price2);
+    assert_eq!(80, price2);
+    assert_eq!(65, price3);
 }