**Describe the bug**
When using axios to get a local file (`file://...`) I get status code 0 as if there's a CORS issue. This didn't happen using version 0.18.0 so I assume that this is a bug?

**To Reproduce**
Get a local file. In my case I wanted to get a PDF as an array buffer.

```js
axios("file://...", {
    responseType: 'arraybuffer'
    headers: {
        Accept: 'application/pdf'
    }
}).then(..)
```

**Expected behavior**
Just like in version 0.18.0 version I should get a 200 response.

**Environment:**
 - Axios Version 0.19.0
 - OS: Windows 10
 - Browser: EO Webbrowser (Chromium)
 - Browser Version: 19.1.95 (Chromium ~70)
 - Additional Library Versions:  React 16.8.6

**Additional context/Screenshots**
Need to build and run index.html locally so you're making the request from file:// as well.
lib/core/settle.js
'use strict';
var createError = require('./createError');
/**
 * Resolve or reject a Promise based on response status.
 *
 * @param {Function} resolve A function that resolves the promise.
 * @param {Function} reject A function that rejects the promise.
 * @param {object} response The response.
 */
module.exports = function settle(resolve, reject, response) {
  var validateStatus = response.config.validateStatus;
  if (!validateStatus || validateStatus(response.status)) {
    resolve(response);
  } else {
    reject(createError(
      'Request failed with status code ' + response.status,
      response.config,
      null,
      response.request,
      response
    ));
  }
};