title: Update package in conda-forge, when uploader is "conda-forge"
body: <p>I uploaded a Python package to PyPi. Some time after, I decided to try to upload it also to conda-forge, and I discovered that it was there already: 
  <a href="https://anaconda.org/conda-forge/cmapy" rel="nofollow noreferrer">https://anaconda.org/conda-forge/cmapy</a></p>
  
  <p>This is a nice surprise, but I would like to understand how this happens, who uploaded the package? (maybe an automatic script?), and, how can I update my package in conda-forge when it is updated in PyPi?</p>