Update core-js to the latest version 🚀

[greenkeeper[bot]]

The dependency core-js was updated from 3.4.5 to 3.4.6.

This version is not covered by your current version range.

If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update.

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Publisher: zloirock License: MIT

Find out more about this release.

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Your Greenkeeper bot :palm_tree:

[greenkeeper[bot]]

• The dependency core-js was updated from 3.4.5 to 3.4.7.

Update to this version instead 🚀

Release Notes for 3.4.7 - 2019.12.03

• Fixed an NPM publishing issue