title: Warning after I run the command "conda env create -f environment.yml"
body: <p>After I run the <code>conda env create -f environment.yml</code> in Conda, I receive the following  warning:</p>
  
  <blockquote>
    <p>Warning : you have pip-installed dependencies in your environment file, but you do not list pip itself as one of your conda dependencies...</p>
  </blockquote>
  
  <p><strong>What does this mean and what should I be doing instead?</strong></p>