title: How to add git source in requirements.txt
body: <p>I would like to install a certain package from a private git repository. This is possible using <code>pip install git+&lt;REPO_LINK&gt;</code>. However, I would like to <code>pip install -r requirements.txt</code> all of my packages at the same time without having to specify which one comes from Pypi and private repo.</p>
  
  <p>I have tried adding a configuration in <code>~/.config/pip/pip.conf</code></p>
  
  <pre><code>[global]
  find-links =
      git+&lt;REPO_LINK&gt;
  </code></pre>
  
  <p>but this happened when running <code>pip install -r requirements.txt</code>: </p>
  
  <p><code>ERROR: Could not find a version that satisfies the requirement my-package==0.1</code></p>
  
  <p>Thanks in advance.</p>