code: def start(name):
      # type: (str) -> None
      
      hotfix_branch = 'hotfix/' + common.to_branch_name(name)
      master = conf.get('git.master_branch', 'master')
  
      common.assert_on_branch(master)
      common.git_checkout(hotfix_branch, create=True)
docs: Start working on a new hotfix.
  
      This will create a new branch off master called hotfix/<name>.
  
      Args:
          name (str):
              The name of the new feature.