Axios 0.19.0 issue

Describe the bug I have problem with axios 0.19.0 , my code works well with axios 0.18.0 , I think axios 19 has issue with baseUrl config

To Reproduce

https://runkit.com/sm2017/5d748f34dda96b001a60f5d0

var axios = require("axios")

const instance = axios.create({
  baseUrl:'https://github.com/axios',
});

await instance.get('/axios');

Error: connect ECONNREFUSED 127.0.0.1:80
A stack trace for this error could not be retrieved because stack was already called.

Expected behavior It must load axios github page

Environment:

• Axios Version [e.g. 0.18.0] 0.0.19
• OS: [e.g. iOS 12.1.0, OSX 10.13.4] , windows 10
• Browser [e.g. Chrome, Safari] nodejs
• Browser Version [e.g. 22] v10.15.3
• Additional Library Versions [e.g. React 16.7, React Native 0.58.0] I test in react native 0.60.5 too

Additional context/Screenshots Add any other context about the problem here. If applicable, add screenshots to help explain.

[sm2017]

So it is a brwaking change

[sm2017]

@dingziqi , @cesar18pena what do you think about the following codes

var axios = require("axios@0.18.0")

const instance = axios.create({
  baseURL:'https://postman-echo.com/',
  url:'/get',
  params:{
    "foo1": "bar1",
    "foo2": "bar2"
  }
});

const {data} = await instance.request();

console.log(data)

var axios = require("axios")

const instance = axios.create({
  baseURL:'https://postman-echo.com/',
  url:'/get',
  params:{
    "foo1": "bar1",
    "foo2": "bar2"
  }
});

const {data} = await instance.request();

console.log(data)

https://runkit.com/embed/nzbzdjc4auv7 works well but https://runkit.com/embed/lro4kcp7w8ir not