Update dependency tslint to v5.12.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
tslint	dependencies	minor	5.11.0 -> 5.12.0	homepage, source

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Release Notes

palantir/tslint

### [`v5.12.0`](https://renovatebot.com/gh/palantir/tslint/blob/master/CHANGELOG.md#v5120) [Compare Source](https://renovatebot.com/gh/palantir/tslint/compare/5.11.0...5.12.0)

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