title: Carthage: How to get the very latest version of a given repository?
body: <p>The Cartfile documentation makes the assertion:</p>
  
  <blockquote>
    <p>If no version requirement is given, any version of the dependency is allowed.</p>
  </blockquote>
  
  <p>with the contradictory example:</p>
  
  <pre><code># Use the latest version
  github "jspahrsummers/xcconfigs"
  </code></pre>
  
  <p>Furthermore, it is not stated, but from testing, I infer that "latest" is actually the version of the latest tag. Is this interpretation correct? And if so, how does one specify the very latest commit - do you have to manually check and specify the latest commit, or is there a simpler way?</p>