Update prop-types to the latest version 🚀

[greenkeeper]

The dependency prop-types was updated from 15.6.2 to 15.7.0.

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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[coveralls]

Pull Request Test Coverage Report for Build 378

• 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 82.817%

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Totals
Change from base Build 365:	0.0%
Covered Lines:	209
Relevant Lines:	245

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💛 - Coveralls

[greenkeeper]

• The dependency prop-types was updated from 15.6.2 to 15.7.1.

Update to this version instead 🚀

[greenkeeper]

• The dependency prop-types was updated from 15.6.2 to 15.7.2.

Update to this version instead 🚀