title: I get an error on getInstance() method even though i followed the osmdroid documentation correctly
body: <p>getInstance() shows an error after following the doc correctly. but i need to know what version to be used here:</p>
  
  <pre><code>dependencies {
      compile 'org.osmdroid:osmdroid-android:(INSERT_VERSION_HERE):release@aar'
  }
  </code></pre>
  
  <p>LINK <a href="https://github.com/osmdroid/osmdroid/wiki/How-to-use-the-osmdroid-library#main-activity" rel="nofollow noreferrer">https://github.com/osmdroid/osmdroid/wiki/How-to-use-the-osmdroid-library#main-activity</a><a href="https://i.stack.imgur.com/pVeVn.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/pVeVn.png" alt="enter image description here"></a></p>
  
  <p>Any help?</p>