Update dependency tslint to v6.1.1

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
tslint (source)	devDependencies	patch	6.1.0 -> 6.1.1

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Release Notes

palantir/tslint

### [`v6.1.1`](https://togithub.com/palantir/tslint/blob/master/CHANGELOG.md#v611) [Compare Source](https://togithub.com/palantir/tslint/compare/6.1.0...6.1.1) - [bugfix] upgrade mkdirp dependency to `^0.5.3` ([#​4918](https://togithub.com/palantir/tslint/issues/4918))

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