chore(deps): update dependency tslint to ^6.1.1

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
tslint (source)	devDependencies	patch	^6.1.1	homepage, source

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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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[codecov-io]

Codecov Report

Merging #672 into master will not change coverage by %. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #672   +/-   ##
=======================================
  Coverage   82.40%   82.40%           
=======================================
  Files          15       15           
  Lines        2126     2126           
  Branches      509      448   -61     
=======================================
  Hits         1752     1752           
  Misses        364      364           
  Partials       10       10           

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