title: Laravel 5.4 + Dingo Api can't get array of post form-data
body: <p>everybody. I building Laravel api application with DingoApi and I can't get data from postman with <strong><em>"form-data"</em></strong> format. 
  I trying to retreive data with DingoApi functionality, and with Laravel's </p>
  
  <pre><code>Route::post('/test', function (\Illuminate\Http\Request $request) {
      return request();
  });
  
  $api-&gt;post('test', function (Request $request){
      return response()-&gt;json($request-&gt;getContent());
  });
  </code></pre>
  
  <p>And just can see something like this</p>
  
  <p><code>{"------WebKitFormBoundary5OJm609mWgC6xr8r\r\nContent-Disposition:_form-data;_name":"\"test1\"\r\n\r\nval1\r\n------WebKitFormBoundary5OJm609mWgC6xr8r\r\nContent-Disposition: form-data; name=\"test2\"\r\n\r\nval2\r\n------WebKitFormBoundary5OJm609mWgC6xr8r--\r\n"}</code>,</p>
  
  <p>but with "raw" everything allright.  </p>
  
  <p>So, how I can get array from POST query?</p>