Update babel-preset-env from 1.6.0 to 1.6.1

[dependencies]

babel-preset-env has been updated to 1.6.1 by dependencies.io

1.6.1

🐛 Bug Fix

• Update compat table to fix two small issues (#445) (danez)

ES2015 destructuring is not fully supported in Edge 15 and the polyfill required again. es6.math.imul is supported on Android as of version 4.4

• Add polyfills for ES6 static Object methods (#441) (danez)

Functions such as Object.keys, Object.freeze, ... do already exist in ES5, but their behaviour changed in ES2015. babel-preset-env with builtIns: true now adds the core-js polyfills for this methods if the browser only supports the ES5 variant of the method (like IE11 for example)

• Normalize module format of plugins/built-ins data (#376) (rtsao)