title: Cannot find method createNotificationChannel(NotificationChannel)
body: <p>I'm trying to handle notification with Android Oreo (SDK 27).</p>
  
  <p>Here is my code creating the NotificationChannel:</p>
  
  <pre><code>NotificationManagerCompat notificationManager = NotificationManagerCompat.from(this);
  // .. building mChannel, the NotificationChannel instance
  notificationManager.createNotificationChannel(mChannel);
  </code></pre>
  
  <p>Android Studio tells this </p>
  
  <pre><code>Error:(67, 32) error: cannot find symbol method createNotificationChannel(NotificationChannel)
  </code></pre>
  
  <p>I've a dependency on support-compat:27.0.0 set into my core/build.gradle file:</p>
  
  <pre><code>compile 'com.android.support:support-compat:27.0.0'
  </code></pre>