[docs] axios @types typings are deprecated

[Dimava]

Docs say

Install type definitions

install those even in javascript projects

// if you use express
npm install --dev @types/axios @types/express

Which causes a warning:

WARN  deprecated @types/axios@0.14.0:
  This is a stub types definition for axios (https://github.com/mzabriskie/axios).
  axios provides its own type definitions, so you don't need @types/axios installed!

[ecyrbe]

Thanks, fixed.