title: Fastlane uses wrong cocoapod version
body: <p>When using fastlane and cocoapods to build our iOS app I noticed that fastlane does not use the version of cocoapods that I have installed using </p>
  
  <pre><code>sudo gem install cocoapods
  </code></pre>
  
  <p>When running </p>
  
  <p><code>pod --version</code></p>
  
  <p>it returns the latest version which is of this moment </p>
  
  <blockquote>
    <p>1.3.1</p>
  </blockquote>
  
  <p>However, when running a build lane in fastlane it uses cocoapods version 1.2.1 for some reason. </p>
  
  <p>I use this in my Fastfile to clean and pod install</p>
  
  <pre><code>  cocoapods(
      clean: true,
      podfile: "Podfile"
    )
  </code></pre>
  
  <p>Is there a way I can tel fastlane to use a specific version of cocoapods? Or use the version I have installed manually? </p>