title: imported library not found after npm install
body: <p>Following steps from : <a href="https://github.com/appfeel/node-pushnotifications#installation" rel="nofollow noreferrer">https://github.com/appfeel/node-pushnotifications#installation</a></p>
  
  <p>I've installed package : </p>
  
  <pre><code>npm install node-pushnotifications --save
  + node-pushnotifications@1.1.9
  updated 1 package and audited 244 packages in 14.663s
  found 0 vulnerabilities
  </code></pre>
  
  <p>Using <code>import PushNotifications from 'node-pushnotifications';</code></p>
  
  <p>returns error : </p>
  
  <pre><code>&gt; import PushNotifications from 'node-pushnotifications';
  import PushNotifications from 'node-pushnotifications';
         ^^^^^^^^^^^^^^^^^
  </code></pre>
  
  <p>I'm unfamiliar with this method of importing a library. For all others I've used such as express the import is as following : </p>
  
  <pre><code>var express = require('express');
  </code></pre>
  
  <p>Have I missed a step ?</p>
  
  <p>How to install and import PushNotifications ? </p>