title: Where is `sequence` in Scalaz7
body: <p>I am learning Scalaz and I have a project that already makes use of Scalaz7. Following <a href="https://stackoverflow.com/questions/2569014/convert-a-list-of-options-to-an-option-of-list-using-scalaz">this question</a> I would like to use the function</p>
  
  <pre><code>sequence[T](l: List[Option[T]]): Option[List[T]]
  </code></pre>
  
  <p>(not that it is hard to write it myself). But the aforementioned question mentions Scalaz6.</p>
  
  <blockquote>
    <p>Where to find the sequence function in Scalaz7?</p>
  </blockquote>