Update dependency tsc-watch to ^4.2.3

Created by: renovate[bot]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
tsc-watch	devDependencies	minor	^4.2.3	source

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Release Notes

gilamran/tsc-watch

v4.2.3

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v4.2.2

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v4.2.1

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v4.2.0

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v4.2.0 - 29/2/2020

Using readline instead of raw stdout buffer - (Thanks to @​Janpot for the idea)

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Renovate configuration

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