Update @types/core-js to the latest version 🚀

[greenkeeper[bot]]

The devDependency @types/core-js was updated from 2.5.0 to 2.5.1.

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.

---

Find out more about this release.

FAQ and help

There is a collection of [frequently asked questions](https://greenkeeper.io/faq.html). If those don’t help, you can always [ask the humans behind Greenkeeper](https://github.com/greenkeeperio/greenkeeper/issues/new).

---

Your Greenkeeper bot :palm_tree:

[coveralls]

Pull Request Test Coverage Report for Build 625

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.2%) to 87.136%

---

Totals
Change from base Build 509:	0.2%
Covered Lines:	1681
Relevant Lines:	1862

---

💛 - Coveralls

[greenkeeper[bot]]

• The devDependency @types/core-js was updated from 2.5.0 to 2.5.2.

Update to this version instead 🚀

[greenkeeper[bot]]

• The devDependency @types/core-js was updated from 2.5.0 to 2.5.3.

Update to this version instead 🚀