title: typings.json not getting updated typings install --ambient
body: <p>I used to work with <code>tsd</code> for managing my type definitions, but as it's deprecated, I'm trying to migrate to <code>typings</code> which is my opinion more complicated, but should be the way to go, I guess.</p>
  
  <p>I want to install a type definition and for that I use the <code>--ambient</code> flag.</p>
  
  <p>In <strong>Visual Studio</strong> I have the <code>typings.json</code> file which looks like that:</p>
  
  <pre><code>{
    "name": "Test",
    "version": false,
    "ambientDependencies": {
      "angular": "github:DefinitelyTyped/DefinitelyTyped/angularjs/angular.d.ts#ca92a5b250433c38230b5f4138b36453862342bf",
      "jquery": "github:DefinitelyTyped/DefinitelyTyped/jquery/jquery.d.ts#ca92a5b250433c38230b5f4138b36453862342bf"
    }
  }
  </code></pre>
  
  <p>This was automatically created when migrating from <code>tsd</code> to <code>typings</code> but now once I need a new type definition, for instance <code>angular-route</code> I use the following command:</p>
  
  <p><code>typings install angular-route --ambient</code></p>
  
  <p>This works fine, but the <code>typings.json</code> does not get updated.</p>
  
  <p>What is the point and why am I missing? Why were <code>angular</code> and <code>jquery</code> both migrated to <code>typings.json</code> and when installing <code>angular-route</code>the file does not get refreshed?</p>