title: How to do a git install with constraints in a requirements file?
body: <p>I have a package I want to install with a constraints file. How can you specify constraints file with a git URL in a <code>requirements</code> file?</p>
  <p>ex. what I have <code>-e git+https://....#egg=package</code> I want to add constraints as well. Using <code>-e git+https://....#egg=package --constraints constraints.txt</code> doesn't seem to work as there are still package conflicts that happen.</p>