title: Debugger gem not supported in Ruby 2.1.0 / 2.1.1 / 2.1.2
body: <p>I just upgraded my RVM Ruby installation to version 2.1.0 and tried to bundle install when I got the following error:</p>
  
  <pre><code>Gem::Ext::BuildError: ERROR: Failed to build gem native extension.
  Ruby version 2.1.0 is not supported.
  *** extconf.rb failed ***
  </code></pre>
  
  <p>The error of course is self-explanatory, but I was wondering if there was a way to make the Debugger gem work with the latest release of Ruby? </p>