Update dependency tsc-watch to v4

Created by: renovate[bot]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
tsc-watch	devDependencies	major	^4.0.0	source

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Release Notes

gilamran/tsc-watch

v4.0.0

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v4.0.0 - 19/9/2019

Terminating previous processes is now done with SIGTERM instead of SIGUSR2. - (Thanks to @​zontarian)

v3.0.2

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v3.0.1

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v3.0.0

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v3.0.0 - 9/9/2019

onSuccess will run on EVERY successful compilation, also on the first success. - (Thanks to @​mchl-hub for the idea)

v2.4.0

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