remove car's excepton throw

Author: CarlyLanglois

src/org/launchcode/java/demos/testing/main/Car.java

@@ -47,9 +47,6 @@ public double getGasTankLevel() {
     }
 
     public void setGasTankLevel(double gasTankLevel) {
-        if (gasTankLevel > this.getGasTankSize()) {
-            throw new IllegalArgumentException("Can't exceed tank size");
-        }
         this.gasTankLevel = gasTankLevel;
     }