Updated params on the Car Example

According to the latest fix in May 2021

Author: timnqp

README.md

@@ -159,8 +159,8 @@ const Car = {
   carColor: 'Blue'
 };
 
-function paintCar(car) {
-  car.carColor = 'Red';
+function paintCar(car, color) {
+  car.carColor = color;
 }
 ```
 
@@ -172,8 +172,8 @@ const Car = {
   color: 'Blue'
 };
 
-function paintCar(car) {
-  car.color = 'Red';
+function paintCar(car, color) {
+  car.color = color;
 }
 ```
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