Update dependency chokidar to v2.1.8

This MR contains the following updates:

Package	Change	Age	Confidence
chokidar	2.1.2 -> 2.1.8

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Release Notes

paulmillr/chokidar (chokidar)

v2.1.8

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v2.1.6

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v2.1.5

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v2.1.4

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v2.1.3

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