title: conda build: how to embed version number in python project
body: <p>i'd like to be able to do:</p>
  
  <pre><code>import pyproject
  print(pyproject.__version__)
  </code></pre>
  
  <p>in a conda built Python project <code>pyproject</code> </p>
  
  <p>I can't figure out how to do this in the meta.yaml, or find an example on conda-forge where this is done. </p>
  
  <p>Thanks</p>