title: `npm link --save` does not update dependencies on my package.json
body: <p>I am using <code>npm link package --save</code> to create a local link to a globally installed package. </p>
  
  <p>It correctly creates the link to the package (and would install it globally in case it were not already installed); but it fails to update the dependencies in <code>package.json</code>. </p>
  
  <p>What I am missing here?</p>