Update prop-types in group default to the latest version 🚀

[greenkeeper]

Version 15.6.2 of prop-types was just published.

Dependency	[prop-types](https://github.com/facebook/prop-types)
Current Version	15.6.1
Type	dependency

The version 15.6.2 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.

It might be worth looking into these changes and trying to get this project onto the latest version of prop-types.

If you have a solid test suite and good coverage, a passing build is a strong indicator that you can take advantage of these changes directly by merging the proposed change into your project. If the build fails or you don’t have such unconditional trust in your tests, this branch is a great starting point for you to work on the update.

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Commits

The new version differs by 15 commits.

• fa6fbb7 15.6.2
• 5115f5c Merge pull request #180 from jaller94/master
• 2ac742c Merge pull request #171 from barrymichaeldoyle/master
• a7a5a64 Merge pull request #194 from facebook/no-fbjs
• d6c9c5c Preserve "Invariant Violation" name
• 07d1b47 Remove fbjs dependency
• 3c99d57 Remove trailing spaces
• a36cda8 Move explanation of isRequired and show it in PropTypes.shape
• ba3da12 Show that shapes can have required properties
• 2bde8eb Add example for PropTypes.exact
• d65f80e Updated vars to consts and lets in PropTypesProductionStandalone-test.js
• c10c93f Updated vars to consts and lets in PropTypesDevelopmentStandalone-test.js
• 8e2b34e Updated vars to consts and lets in PropTypesDevelopmentReact15.js
• c5527c8 Updated vars with consts and lets in PropTypesProductionReact15-test.js
• 7cc8c81 Add 15.6.1 to CHANGELOG

See the full diff

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