Please update to babel 6

[sakarit-zz]

I can not use this package in my project because I already have babel 6 in use. Trying to use babel 5 and 6 in the same project causes errors.

[timdp]

Also, it doesn't make a lot of sense to show

    babelOptions: {
        presets: ['es2015']
    }

if you don't actually support that yet.