[Snyk] Upgrade tslint from 5.11.0 to 5.20.1

[raakasf]

Snyk has created this PR to upgrade tslint from 5.11.0 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 12 versions ahead of your current version.
• The recommended version was released a year ago, on 2019-11-05.

The recommended version fixes:

Severity	Issue	PriorityScore (*)	Exploit Maturity
	Arbitrary Code Execution SNYK-JS-JSYAML-174129	405/1000 Why? CVSS 8.1	No Known Exploit
	Denial of Service (DoS) SNYK-JS-JSYAML-173999	405/1000 Why? CVSS 8.1	No Known Exploit

(*) Note that the real score may have changed since the PR was raised.

Release notes

Package name: tslint

• 5.20.1 - 2019-11-05
  

  No changes from v5.20.0, just re-released to correctly mark with the latest dist-tag on NPM.

• 5.20.0 - 2019-09-10
  
  • [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
• 5.19.0 - 2019-08-20
  
  • [bugfix] relax promise-function-async for short parenthesized arrow functions (#4765)
  • [bugfix] fix no-async-without-await false positive for abstract methods (#4782)
  • [bugfix] fix strict-comparison false positive for null and undefined literals (#4786)
  • [bugfix] improve no-angle-bracket-type-assertion autofix semantics with more parentheses (#4823)
  • [enhancement] add BigInt support to restrict-plus-operands rule (#4814)
  • [enhancement] await-promise now supports new TypeScript 3.6 AST API symbols for async iterators (#4800)
  • [new-rule-option] check-strings and check-regex options for max-line-length rule (#4798)
  • [new-rule-option] variable-declaration-ignore-function option for typedef rule (#4769)
  • [new-rule-option] ignore-blank-lines option for object-literal-sort-keys rule (#4808)
  • [new-rule] no-for-in (#4747)
  • [new-rule] invalid-void (#4736)
  • [new-rule] strict-string-expressions reports errors on type coercions found in string expressions (#4807)
  • [new-rule] no-promise-as-boolean (#4790)
  • [docs] link to OSS fellowship medium post in README (#4821)

  Thanks to our contributors!

  • Josh Pike
  • Tanmoy Bhowmik
  • Michael Withagen
  • Evgeniy Timokhov
  • Vitalij Krotov
  • Josh Goldberg
  • Veda
  • Guido
  • Robert Fink
  • Max Sysoev
• 5.18.0 - 2019-06-21
• 5.17.0 - 2019-05-30
• 5.16.0 - 2019-04-16
• 5.15.0 - 2019-04-01
• 5.14.0 - 2019-03-13
• 5.13.1 - 2019-03-01
• 5.13.0 - 2019-02-23
• 5.12.1 - 2019-01-10
• 5.12.0 - 2018-12-18
• 5.11.0 - 2018-07-16

from tslint GitHub release notes

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