title: Generate fixed value in json-schema faker
body: <p>I am trying to generate a type property on an object, with a default value, I read the documentation and found nothing related to giving a fixed value to a property.</p>
  
  <p>You can view a link in the tester here: <a href="http://json-schema-faker.js.org/#gist/269c64b0dd1d24dc190370b5cfb2f8a8/0.5.0-rc7" rel="nofollow noreferrer">Json-Schema-faker</a></p>
  
  <p>This is the code I'm putting in the test faker:</p>
  
  <pre><code>{
    "type": "object",
    "properties": {
      "type": {
        "type": "string",
        "default": "testModule"
      },
      "name": {
        "type": "string",
        "faker": "name.findName"
      },
      "email": {
        "type": "string",
        "faker": "internet.email"
      }
    },
    "required": [
      "type",
      "name",
      "email"
    ]
  }
  </code></pre>
  
  <p>The result I have:</p>
  
  <pre><code>{
    "type": "elit et aliqua",
    "name": "velit al",
    "email": "dolor ea in"
  }
  </code></pre>
  
  <p>The result I would want:</p>
  
  <pre><code>{
    "type": "TestModule",
    "name": "velit al",
    "email": "dolor ea in"
  }
  </code></pre>
  
  <p>Thanks for your help!</p>