Update babel presets

[horacioh]

is in the interest of this library to update the babel presets to babel-preset-env ?

if true, I can provide a PR for this. I wanted to update this in my application that uses this package but because it uses the old presets I cannot update.
some official info about this: http://babeljs.io/env

thanks!

[trotzig]

That would be a good change, I would gladly accept a PR making that change.

Also, how is your project set up so that the local .babelrc comes into play? We only expose a precompiled js bundle, so you shouldn't have to transpile the module.

[horacioh]

in my project we are using typescript, so maybe that's causing the transpilation?

I will check this too, but I still think its a good idea to update the babel preset :)