title: Can not use unity ads due to Multiple versions of plugin
body: <p>I recently created a game in unity using C#.
  I decided to add reward ads to my game. So i downloaded the package, created the project and the placement in the dashboard, but when I start to code, exactly at this line inside the void Start() :</p>
  <pre><code>if (Advertisement.IsReady(&quot;myAd&quot;) {
  
  }
  </code></pre>
  <p>I get this error: Severity Code Description Project File Line Suppression State Error CS0433 The type 'Advertisement' exists in both 'UnityEngine.Advertisements.Editor, Version=3.4.6.0, Culture=neutral, PublicKeyToken=null' and 'UnityEngine.Advertisements, Version=3.4.6.0, Culture=neutral, PublicKeyToken=null' Assembly-CSharp C:\Users\MyName\Documents\MyName\MyGame\Assets\Scripts\AdManagementScript.cs 26 Active</p>
  <p>I have no idea what's wrong... Could someone help me, please? Thank you</p>