Status code is missing in toJSON method of axios error

[tsachis]

Description
When calling the toJSON method on an axios error (inside a catch clause), the returned object does not include the error status code.
toJSON is useful for extracting the main error details, and the status code should be part of it as well.

To Reproduce
Run the below code. No status code field in the output.
The only place status code appears in the toJSON object is in the message: "Request failed with status code 404"

There's a status field (which is always undefined btw), but according to the code, it is a connection error string (for example, 'ECONNABORTED'), not the response numeric status code.

const axios = require('axios');

axios.get('http://google.com/404')
  .catch(function (error) {
    console.log(error.toJSON());
  })

Expected behavior
A numeric statusCode field should be part of the toJSON returned object.

Environment:

• Axios Version 0.19.2
• OS: OSX 10.14.6
• Node v12.16.1

[jasonsaayman]

Fixed with #2956 2956