Update dependency tslint to ^5.20.0

Created by: 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

Compare Source

• [bugfix] fix strict-boolean-expressions false positive with "ignore-rhs" option (#​4833)
• [bugfix] fix no-unnecessary-type-assertion no error when "strict": true in compiler flags (#​4841)
• [bugfix] "ignore" option for file-name-casing rule works correctly (#​4848)
• [bugfix] fix array-type false positive for simple parenthesized types with "array-simple" option (#​4844)
• [new-rule-option]object-literal-shorthand supports {"property"?: "never", "method"?: "never"} as config options (#​4842)
• [new-rule-option]: allow-generics option for invalid-void rule (#​4839)
• [new-rule-option] check-super-calls option for unnecessary-constructor rule (#​4813)
• [chore] Upgrade diff dependency to v4.0.1 (#​4845, #​4852)

Thanks to our contributors!

• Bas Bosman
• Tanmoy Bhowmik
• David Zulaica
• Maxime Kjaer
• @​guidsdo
• Pavel Birukov
• Josh Goldberg
• Akshaya Srivatsa

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