title: Dynamically add version number to dest output files w/ grunt
body: <p>I have a <code>package.json</code> file with our version number, such as:</p>
  
  <pre><code>{
      name: "myproject"
      version: "2.0"
  }
  </code></pre>
  
  <p>My goal is to dynamically add the version number from the package.json file into the output files. For example, in the javascript I don't want to manually update the version number, but would like something similar to this to be generated after each grunt build:</p>
  
  <pre><code>/* My Project, v2.0 */
  window.myProject = {
      version: "2.0"
  };
  </code></pre>
  
  <p>Is there an easy way to do this in my Gruntfile.js configuration?</p>