title: What is CocoaPods "(unused)"
body: <p>After running <code>pod outdated</code>, I get the following output</p>
  
  <pre><code>Updating spec repo `master`
  Analyzing dependencies
  The following pod updates are available:
  - AFNetworking 2.4.4 -&gt; 2.5.4 (latest version 3.0.0-beta.2)
  - HexColors 2.2.1 -&gt; 2.2.1 (latest version 3.0.0)
  - Overcoat 3.0.0 -&gt; (unused) (latest version 3.2.1)
  - ReactiveCocoa 2.5 -&gt; 2.5 (latest version 4.0.4-alpha-4)
  </code></pre>
  
  <p>I have not seen this "unused" term before </p>
  
  <p><strong>i.e.</strong></p>
  
  <p><code>Overcoat 3.0.0 -&gt;</code><strong>(unused)</strong> <code>(latest version 3.2.1)</code></p>
  
  <p>What is this? And what does it mean?</p>