Update dependency prop-types to v15.7.2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
prop-types (source)	dependencies	minor	15.6.2 -> 15.7.2

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Release Notes

facebook/prop-types

v15.7.2

Compare Source

• [Fix] ensure nullish values in oneOf do not crash (#​256)
• [Fix] move loose-envify back to production deps, for browerify usage (#​203)

v15.7.1

Compare Source

• [Fix] avoid template literal syntax (#​255, #​254)

v15.7.0

Compare Source

• [New] Add .elementType (#​211)
• [New] add PropTypes.resetWarningCache (#​178)
• oneOf: improve warning when multiple arguments are supplied (#​244)
• Fix oneOf when used with Symbols (#​224)
• Avoid relying on hasOwnProperty being present on values' prototypes (#​112, #​187)
• Improve readme (#​248, #​233)
• Clean up mistaken runtime dep, swap envify for loose-envify (#​204)

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