title: Yarn: unable to clone private github repo. ssh: Could not resolve hostname github: nodename nor servname provided, or not known
body: <p>I have a private repo on github with dependencies on other private github repos and <code>npm install</code> installs all the dependencies without problems. </p>
  
  <p>I installed Yarn (on MacOS) and tried to run <code>yarn</code> in the command line, but it failed cloning the private dependencies with the following error: </p>
  
  <pre><code>ssh: Could not resolve hostname github: nodename nor servname provided, or not known
  fatal: Could not read from remote repository.
  </code></pre>
  
  <p>How do I make yarn install the modules? Thanks!</p>