build(deps-dev): bump tslint from 6.1.1 to 6.1.2 (#332)

build(deps-dev): bump tslint from 6.1.1 to 6.1.2 (#332)

Bumps [tslint](https://github.com/palantir/tslint) from 6.1.1 to 6.1.2.
- [Release notes](https://github.com/palantir/tslint/releases)
- [Changelog](https://github.com/palantir/tslint/blob/master/CHANGELOG.md)
- [Commits](https://github.com/palantir/tslint/compare/6.1.1...6.1.2)

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Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>