title: How to tell what version of Node a project/application needs
body: <p>I do a lot of browsing on GitHub and find neat little Node projects that I like to play around with. The only problem is, most come with hardly any documentation. For starters, which version of Node I need to be using in order to run the project/application. I use <code>nvm</code> so I can easily swap between versions, but not knowing what version I need is a little frustrating.</p>
  
  <p>Is there a specific way, possibly by examining the source code, to tell which version of Node I need to use in order to install/run an application?</p>