title: Warning parser/current is loading parser/ruby22
body: <p>I'm newbie in Ruby, while excecuting a command I got this error.</p>
  
  <pre><code>warning: parser/current is loading parser/ruby22, which recognizes
  warning: 2.2-compliant syntax, but you are running 2.3.1.
  </code></pre>
  
  <p>My Ruby version is 2.3.1
  My parser version is 2.4.0.0.</p>
  
  <p>I don't know why parser is loading from ruby22 which is not even installed in my computer.</p>
  
  <p>Any help would be appreciated.</p>