chore(deps): update dependency watchify to v4

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
watchify	3.11.1 -> 4.0.0

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Release Notes

browserify/watchify

v4.0.0

Compare Source

• Update dependencies.

This release drops support for Node.js versions older than 8.10, following the upgrade to chokidar 3.x.

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Configuration

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