Update dependency tslint to v5.20.1

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
tslint (source)	devDependencies	patch	5.20.0 -> 5.20.1

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Release Notes

palantir/tslint

### [`v5.20.1`](https://togithub.com/palantir/tslint/blob/master/CHANGELOG.md#v5201) [Compare Source](https://togithub.com/palantir/tslint/compare/5.20.0...5.20.1) No changes from v5.20.0, just re-released to correctly mark with the `latest` dist-tag on NPM.

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