Update dependency mpath to ~0.9.0

[ghost]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
mpath	~0.5.0 -> ~0.9.0

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Release Notes

aheckmann/mpath (mpath)

v0.9.0

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• feat: export stringToParts()

v0.8.4

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• fix: throw error if parts contains an element that isn't a string or number #​13

v0.8.3

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• fix: use var instead of let/const for Node.js 4.x support

v0.8.2

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• fix(stringToParts): fall back to legacy treatment for square brackets if square brackets contents aren't a number Automattic/mongoose#9640
• chore: add eslint

v0.8.1

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• fix(stringToParts): handle empty string and trailing dot the same way that split() does for backwards compat

v0.8.0

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• feat: support square bracket indexing for get(), set(), has(), and unset()

v0.7.0

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• BREAKING CHANGE: remove component.json #​9 AlexeyGrigorievBoost

v0.6.0

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• feat: support setting dotted paths within nested arrays

v0.5.2

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• fix: avoid using subclassed array constructor when doing map()

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