axiosync v0.19.0-beta.4

Just add sync attribute to config.
It just available in browser enviroment.

axios.get('/aaa', { sync: true })
axios.post('/bbb', { param1: 'value1'}, { sync: true })

fork from: https://github.com/jamesltesim02/axios

github: https://github.com/jamesltesim02/axios