Update dependency babel-preset-env to v1.6.1

[renovate-tests]

This Pull Request updates dependency babel-preset-env from v1.6.0 to v1.6.1

Release Notes

v1.6.1

FYI we are moving this repo/package into https://github.com/babel/babel

🐛 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)

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This PR has been generated by Renovate Bot.

[renovate-tests]

Lock file problem

Renovate failed when attempting to generate a lock file. This is usually happens when you have private modules but have not added configuration for private module support. It is strongly recommended that you do not merge this PR as-is.

Renovate will not retry generating a lockfile for this PR unless either (a) the package.json in this branch needs updating, or (b) you rename then delete this PR unmerged, so that it can be regenerated.

The output from stderr is included below:

yarn.lock