title: graphene-django converts models.BigInteger() to graphene.Integer()
body: <p>I'm using graphene-django.</p>
  
  <p>I'm trying to retrieve data from a <code>models.BigInteger()</code> field, but when I make the query in graphiQL I get the error</p>
  
  <pre><code>{
    "errors": [
      {
        "message": "Int cannot represent non 32-bit signed integer value: 2554208328"
      }
    ],
    "data": {
      "match": null
    }
  }
  </code></pre>
  
  <p>Anyone know how I can force graphene to give me the data?</p>