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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[codecov]

Codecov Report

Merging #27 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #27   +/-   ##
=======================================
  Coverage   96.96%   96.96%           
=======================================
  Files           4        4           
  Lines          33       33           
  Branches        6        6           
=======================================
  Hits           32       32           
  Misses          1        1

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[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 🚀