title: Save peer dependencies in npm with a command
body: <p>Is there a way to achieve that using npm  ? Currently I do this manually, would be nice to use similar approach as with npm install --save</p>
  
  <p>I found some old discussion and commits but it seems it didn't make it:</p>
  
  <p><a href="https://github.com/npm/npm/pull/3994" rel="noreferrer">https://github.com/npm/npm/pull/3994</a></p>