Unity 5 particle-deleting c# Script

I was following a unity tutorial started on Unity 4 but I am on Unity 5, and when I try to use the script seen (https://youtu.be/vwUahWrY9Jg?t=1337) and I try to use it, it gives an error:

Assets/Scripts/DestroyFinishedParticle.cs(18,17): error CS0246: The type or namespace name `Destroy' could not be found. Are you missing a using directive or an assembly reference?

this is the code:

using UnityEngine;
using System.Collections;

public class DestroyFinishedParticle : MonoBehaviour {

    private ParticleSystem thisParticleSystem;

    // Use this for initialization
    void Start () {
        thisParticleSystem = GetComponent<ParticleSystem>();
    }

    // Update is called once per frame
    void Update() {
        if (thisParticleSystem.isPlaying)
            return;

        Destroy (GameObject);
    }
}

It can be because C# code for unity changed from 4 to 5? what should I change? The problem seems to be in the Update method.

Copyright Notice：Content Author:「Ivanol mindez」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/32297376/unity-5-particle-deleting-c-sharp-script