chore(deps): update dependency chokidar to v2.1.4

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
chokidar	devDependencies	patch	2.1.2 -> 2.1.4	source

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Release Notes

paulmillr/chokidar

### [`v2.1.4`](https://togithub.com/paulmillr/chokidar/blob/master/CHANGELOG.md#Chokidar-214-Mar-22-2019) [Compare Source](https://togithub.com/paulmillr/chokidar/compare/2.1.3...2.1.4) - Improve TypeScript type definitions for `on` method. ### [`v2.1.3`](https://togithub.com/paulmillr/chokidar/blob/master/CHANGELOG.md#Chokidar-213-Mar-22-2019) [Compare Source](https://togithub.com/paulmillr/chokidar/compare/2.1.2...2.1.3) - Improve atomic writes handling

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