title: Remove a cordova plugin
body: <p>I am having issues trying to use Onesignal for Ionic because I am getting the following error regarding FCM plugin which I attempted to use for notifications before :</p>
  
  <pre><code>UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): Error: cordova-plugin-fcm: You have installed platform android but file 'google-services.json' was not found in your Cordova project root folder.
  (node:13416) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
  </code></pre>
  
  <p>I want to try and remove the FCM plugin entirely and see if that fixes it, however I am unable to do so. </p>
  
  <p>When I run <code>sudo cordova plugin</code> I see the following for FCM:
  <code>cordova-plugin-fcm 2.1.2 "FCMPlugin</code></p>
  
  <p>I have tried to remove by doing <code>sudo cordova plugin remove FCM</code> and <code>sudo cordova plugin remove cordova-plugin-fcm 2.1.2 "FCMPlugin"</code> but neither works</p>