return true on save method to continue chaining

The save method isn't returning this, so the car variable
is equal to undefined instead of a Car object.

BTW, Thanks alot for this guide.

Author: sney2002

README.md

@@ -1563,6 +1563,8 @@ class Car {
 
   save() {
     console.log(this.make, this.model, this.color);
+    // NOTE: Returning this for chaining
+    return this;
   }
 }