title: rgdal not available for R version 3.2.2
body: <p>I am trying out the examples mentioned in <a href="http://pakillo.github.io/R-GIS-tutorial/" rel="noreferrer">this link</a> . I have successfully installed all the packages mentioned as the basic packages here. 
  When I try to use command <code>gmap</code> (given in the example as <code>mymap &lt;- gmap("France")</code> i get the following problem: </p>
  
  <pre><code>&gt; gmap("France")
  Loading required namespace: rgdal
  Failed with error:  ‘there is no package called ‘rgdal’’
  Error in gmap("France") : rgdal not available
  </code></pre>
  
  <p>Also I am aware that <code>gmap</code> command belongs to the package <code>dismo</code>. And I have successfully installed this package. </p>