Currently, if you use axios with async / await, you get a stack trace like this:

```
Request failed with status code 500
    at createError (/Users/rmenezes/code/seedfi/web/node_modules/axios/lib/core/createError.js:16:15)
    at settle (/Users/rmenezes/code/seedfi/web/node_modules/axios/lib/core/settle.js:17:12)
    at IncomingMessage.handleStreamEnd (/Users/rmenezes/code/seedfi/web/node_modules/axios/lib/adapters/http.js:237:11)
    at IncomingMessage.emit (events.js:208:15)
    at IncomingMessage.EventEmitter.emit (domain.js:471:20)
    at endReadableNT (_stream_readable.js:1154:12)
    at processTicksAndRejections (internal/process/task_queues.js:77:11
```

It doesn't show you much about *what* called Axios., which makes debugging quite difficult!

This is because `settle` calls `createError`:
https://github.com/axios/axios/blob/master/lib/core/settle.js#L12-L24

Which creates a new error with a brand new stack trace:
https://github.com/axios/axios/blob/master/lib/core/createError.js#L15-L18

Perhaps we can fix this by creating an error before the request goes out and stitching it to the new error's stack trace?
test/unit/adapters/http.js
bytes: 4,
              download: true
            });
          }
        }()));
      });
    });
  });
  describe('Rate limit', function () {
    it('should support upload rate limit', async function () {
      const secs = 10;
      const configRate = 100_000;
      const chunkLength = configRate * secs;
      server = await startHTTPServer();
      const buf = Buffer.alloc(chunkLength).fill('s');
      const samples = [];
      const skip = 2;
      const compareValues = toleranceRange(10, 50);
      const {data} = await axios.post(LOCAL_SERVER_URL, buf, {
        onUploadProgress: ({loaded, total, progress, bytes, rate}) => {
          samples.push({
            loaded,
            total,
            progress,
            bytes,
            rate
          });
        },
        maxRate: [configRate],
        responseType: 'text',