title: PyCharm, can not import modules
body: <p>I need to import </p>
  
  <pre><code>1.yaml
  2.pypiper
  </code></pre>
  
  <p>modules to the latest <code>PyCharm</code> IDE. I can not find <code>pypiper</code> in the list of available modules. When I am trying to add a new repository for the <code>pypiper</code>: </p>
  
  <p><a href="https://github.com/epigen/pypiper.git" rel="nofollow noreferrer">https://github.com/epigen/pypiper.git</a> </p>
  
  <p>still the same: typing <code>pypiper</code> in the search field does not yield anything. </p>
  
  <p><code>yaml</code> at the same time can be found, but it is giving me an error when I am trying to add it: </p>
  
  <pre><code>Could not find a version that satisfies the requirement yaml (from versions: )
  No matching distribution found for yaml
  </code></pre>