No browsers config for current version of babel

[jakub300]

Browsers were removed from .babelrc in #1004, but current version of babel-preset-env (v1.6.1) support configuration only in .babelrc, not others sources supported by browserslist. They will be supported in upcoming babel v7.

Readme for v1.6.1: https://github.com/babel/babel-preset-env/tree/v1.6.1
Readme for master: https://github.com/babel/babel/tree/master/packages/babel-preset-env#browserslist-support

[LinusBorg]

that will be fixed with #1083