Update firebase to the latest version 🚀

[greenkeeper[bot]]

The devDependency firebase was updated from 5.11.1 to 6.0.0.

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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Find out more about this release.

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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).

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Your Greenkeeper bot :palm_tree:

[coveralls]

Pull Request Test Coverage Report for Build 157

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 138:	0.0%
Covered Lines:	569
Relevant Lines:	569

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 157

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

---

Totals
Change from base Build 138:	0.0%
Covered Lines:	569
Relevant Lines:	569

---

💛 - Coveralls

[greenkeeper[bot]]

• The devDependency firebase was updated from 5.11.1 to 6.0.1.

Update to this version instead 🚀

[greenkeeper[bot]]

• The devDependency firebase was updated from 5.11.1 to 6.0.2.

Update to this version instead 🚀

[greenkeeper[bot]]

• The devDependency firebase was updated from 5.11.1 to 6.0.3.

Update to this version instead 🚀

[greenkeeper[bot]]

• The devDependency firebase was updated from 5.11.1 to 6.0.4.

Update to this version instead 🚀

[greenkeeper[bot]]

• The devDependency firebase was updated from 5.11.1 to 6.1.0.

Update to this version instead 🚀

[greenkeeper[bot]]

• The devDependency firebase was updated from 5.11.1 to 6.1.1.

Update to this version instead 🚀

[greenkeeper[bot]]

• The devDependency firebase was updated from 5.11.1 to 6.2.0.

Update to this version instead 🚀

[greenkeeper[bot]]

• The devDependency firebase was updated from 5.11.1 to 6.2.1.

Update to this version instead 🚀

[greenkeeper[bot]]

• The devDependency firebase was updated from 5.11.1 to 6.2.2.

Update to this version instead 🚀