Update typescript-eslint monorepo to v2.31.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
@typescript-eslint/eslint-plugin	devDependencies	minor	2.30.0 -> 2.31.0
@typescript-eslint/parser	devDependencies	minor	2.30.0 -> 2.31.0

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Release Notes

typescript-eslint/typescript-eslint

v2.31.0

Compare Source

Bug Fixes

• eslint-plugin: [dot-notation] handle missing declarations (#​1947) (383f931)
• eslint-plugin: [method-signature-style] fix overloaded methods to an intersection type (#​1966) (7f3fba3)
• eslint-plugin: [return-await] await in a normal function (#​1962) (f82fd7b)
• eslint-plugin: [unbound-method] false positives for unary expressions (#​1964) (b35070e)
• eslint-plugin: no-base-to-string boolean expression detect (#​1969) (f78f13a)

Features

• eslint-plugin: [member-ordering] add decorators support (#​1870) (f7ec192)
• eslint-plugin: [prefer-optional-chain] added option to convert to suggestion fixer (#​1965) (2f0824b)
• eslint-plugin: new extended rule 'no-invalid-this' (#​1823) (b18bc35)
• eslint-plugin-internal: add rule no-poorly-typed-ts-props (#​1949) (56ea7c9)
• experimental-utils: expose our RuleTester extension (#​1948) (2dd1638)

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