title: How to update anaconda's version in pyenv
body: <p>I'd like to know how to update anaconda in pyenv, inheriting third-party modules I installed to the former version. </p>
  
  <p>I'm now using anaconda3-2.5.0 and would like to use anaconda3-4.0.0. I manage it with pyenv. If I just install the new version via pyenv, is the third party modules I installed inherited to the new version? How can I do that? Should I be careful to make a list of modules I installed, whenever I install a new module, in order to reinstall them at once to the environment(version).</p>
  
  <p>Sorry for my poor English.</p>