docs: def release():
      """Release a new version"""
      release_check()
      build()
      print("Releasing %s version %s." % (env.projname, env.version))
      local("git tag %s" % env.version)
      local('gpg --detach-sign --armor dist/coursera-*.tar.gz*')
      local('twine upload dist/coursera-*.tar.gz*')
      local("git push")
      local("git push --tags")