chore(deps): update dependency tslint to ^5.20.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
tslint (source)	devDependencies	minor	^5.20.0	homepage, source

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Release Notes

palantir/tslint

### [`v5.20.0`](https://togithub.com/palantir/tslint/blob/master/CHANGELOG.md#v5200) [Compare Source](https://togithub.com/palantir/tslint/compare/5.19.0...5.20.0) - [bugfix] fix [`strict-boolean-expressions`](https://palantir.github.io/tslint/rules/strict-boolean-expressions/) false positive with `"ignore-rhs"` option ([#​4833](https://togithub.com/palantir/tslint/issues/4833)) - [bugfix] fix [`no-unnecessary-type-assertion`](https://palantir.github.io/tslint/rules/no-unnecessary-type-assertion/) no error when `"strict": true` in compiler flags ([#​4841](https://togithub.com/palantir/tslint/issues/4841)) - [bugfix] "ignore" option for [`file-name-casing`](https://palantir.github.io/tslint/rules/file-name-casing/) rule works correctly ([#​4848](https://togithub.com/palantir/tslint/issues/4848)) - [bugfix] fix [`array-type`](https://palantir.github.io/tslint/rules/array-type/) false positive for simple parenthesized types with "array-simple" option ([#​4844](https://togithub.com/palantir/tslint/issues/4844)) - [new-rule-option][`object-literal-shorthand`]() supports `{"property"?: "never", "method"?: "never"}` as config options ([#​4842](https://togithub.com/palantir/tslint/issues/4842)) - [new-rule-option]: `allow-generics` option for [`invalid-void`](https://palantir.github.io/tslint/rules/invalid-void) rule ([#​4839](https://togithub.com/palantir/tslint/issues/4839)) - [new-rule-option] `check-super-calls` option for [`unnecessary-constructor`](https://palantir.github.io/tslint/rules/unnecessary-constructor/) rule ([#​4813](https://togithub.com/palantir/tslint/issues/4813)) - [chore] Upgrade `diff` dependency to v4.0.1 ([#​4845](https://togithub.com/palantir/tslint/issues/4845), [#​4852](https://togithub.com/palantir/tslint/issues/4852)) Thanks to our contributors! - Bas Bosman - Tanmoy Bhowmik - David Zulaica - Maxime Kjaer - [@​guidsdo](https://togithub.com/guidsdo) - Pavel Birukov - Josh Goldberg - Akshaya Srivatsa

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[codecov-io]

Codecov Report

Merging #638 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #638   +/-   ##
=======================================
  Coverage   83.09%   83.09%           
=======================================
  Files          15       15           
  Lines        2058     2058           
  Branches      423      423           
=======================================
  Hits         1710     1710           
  Misses        346      346           
  Partials        2        2

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