[Snyk] Upgrade tslint from 5.20.0 to 5.20.1

[snyk-bot]

Snyk has created this PR to upgrade tslint from 5.20.0 to 5.20.1.

ℹ️ Keep your dependencies up-to-date. This makes it easier to fix existing vulnerabilities and to more quickly identify and fix newly disclosed vulnerabilities when they affect your project.

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• The recommended version is 1 version ahead of your current version.
• The recommended version was released 6 months ago, on 2019-11-05.

The recommended version fixes:

Severity	Issue
	CC0-1.0 license snyk:lic:npm:spdx-license-ids:CC0-1.0
	CC-BY-3.0 license snyk:lic:npm:spdx-exceptions:CC-BY-3.0
	CC-BY-4.0 license snyk:lic:npm:caniuse-lite:CC-BY-4.0

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