title: git fork from certain tag version - requirements.txt
body: <p>I want to fork one github project code, but not from master branch, but from older release. </p>
  
  <p>Reason: I want to edit one place in the code in my fork version and put the url of this tag version into my requirements.txt so that </p>
  
  <pre><code>pip install -e git+https://git_url_to_my_form_in_this_tag_version
  </code></pre>
  
  <p>works. </p>
  
  <p>I found the tag version in github, but once I fork it, it is being forked from master and not from exactly that tag. </p>
  
  <p>how can I do it? </p>