title: gem hub not found after ruby upgrade
body: <p>I updated my ruby version to 2.4.4</p>
  
  <p>I am trying to run hub create, but I got the following error:</p>
  
  <pre><code>rbenv: hub: command not found
  
  The `hub' command exists in these Ruby versions:
    2.3.5
  </code></pre>
  
  <p>I have seen that I have like two gems of hub (or paths) in my computer:</p>
  
  <pre><code>which -a hub
  /Users/albertmontolio/.rbenv/shims/hub
  /usr/local/bin/hub
  </code></pre>
  
  <p>I read that I have to uninstall one, so I've done:</p>
  
  <pre><code>gem uninstall -x hub
  </code></pre>
  
  <p>But still I see the two paths and the error: hub command not found is still there.</p>
  
  <p>Why I can not use the gem hub and how can I fix this issue?</p>