title: Hyperopt: return boolean value instead of int
body: <p>In the <code>space</code> param, I declare it as:</p>
  <pre><code>&quot;langevin&quot;: hp.choice(&quot;langevin&quot;, [True, False])
  </code></pre>
  <p>The <code>fmin</code> successfully ran. However when I use: <code>model = Regressor(**best)</code>, it throws: <code> CatBoostError: catboost/private/libs/options/json_helper.h:157: Can't parse parameter &quot;langevin&quot; with value: 1</code></p>
  <p>How can I force the return value as True?</p>