title: NPM custom registry interferes with fontawesome
body: <p>I am running a React project that requires the configuration of a custom registry.</p>
  
  <p>Doing:</p>
  
  <p><code>npm config set registry ...</code> </p>
  
  <p>results in:</p>
  
  <pre><code>npm ERR! Unable to authenticate, need: Basic realm="https://npm.fontawesome.com/"
  </code></pre>
  
  <p>This is despite the fact that root folder of project contains:</p>
  
  <pre><code>@fortawesome:registry=https://npm.fontawesome.com/
  //npm.fontawesome.com/:_authToken=XXX
  </code></pre>
  
  <p>This is happening in Windows 10 but was not happening on OSX or Ubuntu.</p>