title: How to create both short and long options for one option in click (python package)?
body: <p>How do I specify both a short option and long option for the same option?
  e.g., for the following, I also want to use <code>-c</code> for <code>--count</code>:</p>
  
  <pre><code>import click
  
  @click.command()
  @click.option('--count', default=1, help='count of something')
  def my_command(count):
      click.echo('count=[%s]' % count)
  
  if __name__ == '__main__':
      my_command()
  </code></pre>
  
  <p>e.g.,</p>
  
  <pre><code>$ python my_command.py --count=2
  count=[2]
  $ python my_command.py -c 3
  count=[3]
  </code></pre>
  
  <p>References:<br>
  <a href="https://media.readthedocs.org/pdf/pocoo-click/latest/pocoo-click.pdf" rel="noreferrer">click documentation in a single pdf</a><br>
  <a href="https://github.com/pallets/click" rel="noreferrer">click sourcecode on github</a><br>
  <a href="http://click.pocoo.org/5/" rel="noreferrer">click website</a><br>
  <a href="https://pypi.python.org/pypi/click" rel="noreferrer">click PyPI page</a></p>