title: Update version number with versioneer and GitHub
body: <p>I am using <code>versioneer</code> for several of GitHub-hosted Python projects. It seems that versioneer is installed and works ok, and I can call <code>project.__version__</code>.</p>
  
  <p>However, I forgot the procedure on how to update the version number. Should anything in <code>setup.cfg</code> or <code>setup.py</code> be left untouched?</p>
  
  <p>Is it only the <code>git tag</code> command that controls the version number? If I use GitHub's "Draft a new release" would the Python/versioneer version number automatically be updated? Is GitHub's releases the  best way, or should I do, e.g., <code>git tag v0.2</code> locally? I suppose that does not matter?</p>