title: Install Yii2 extension manually without using Composer giving error of class not found
body: <p>I want to install <a href="https://github.com/2amigos/yii2-google-maps-library" rel="nofollow noreferrer">2amigos/yii2-google-maps-library</a> widget Manually.</p>
  
  <p>I have added <code>"2amigos/yii2-google-maps-library" : "*"</code> in required section of <code>composer.json</code> and I have added <code>'dosamigos\\google\\maps\\' =&gt; array($vendorDir . '/2amigos/yii2-google-maps-library'),</code> in <code>composer autoload_psr4.php</code> </p>
  
  <p>I have added <code>'2amigos/yii2-google-maps-library' =&gt; 
    array (
      'name' =&gt; '2amigos/yii2-google-maps-library',
      'alias' =&gt; 
      array (
        '@dosamigos\google\maps' =&gt; $vendorDir . '2amigos/yii2-google-maps-library',
      ),
    ),</code> code in extensions.php of composer.
  And my view code is </p>
  
  <pre><code>&lt;?php
  
      use dosamigos\google\maps\LatLng;
      use dosamigos\google\maps\services\DirectionsWayPoint;
      use dosamigos\google\maps\services\TravelMode;
      use dosamigos\google\maps\overlays\PolylineOptions;
      use dosamigos\google\maps\services\DirectionsRenderer;
      use dosamigos\google\maps\services\DirectionsService;
      use dosamigos\google\maps\overlays\InfoWindow;
      use dosamigos\google\maps\overlays\Marker;
      use dosamigos\google\maps\Map;
      use dosamigos\google\maps\services\DirectionsRequest;
      use dosamigos\google\maps\overlays\Polygon;
      use dosamigos\google\maps\layers\BicyclingLayer;
  
  /* @var $this yii\web\View */
  $this-&gt;title = Yii::$app-&gt;name;
  ?&gt;
  &lt;section&gt;
      &lt;div class="container"&gt;
          &lt;div class="row"&gt;
  
              &lt;?php 
                  $coord = new LatLng(['lat' =&gt; 39.720089311812094, 'lng' =&gt; 2.91165944519042]);
                  $map = new Map([
                      'center' =&gt; $coord,
                      'zoom' =&gt; 14,
                  ]);
               ?&gt;
  
          &lt;/div&gt;
      &lt;/div&gt;
  &lt;/section&gt;
  </code></pre>
  
  <p>But when i run this give me error</p>
  
  <pre><code>Class 'dosamigos\google\maps\LatLng' not found
  </code></pre>