Update typescript-eslint monorepo to v2.12.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
@typescript-eslint/eslint-plugin	devDependencies	minor	2.11.0 -> 2.12.0
@typescript-eslint/parser	devDependencies	minor	2.11.0 -> 2.12.0

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Release Notes

typescript-eslint/typescript-eslint

### [`v2.12.0`](https://togithub.com/typescript-eslint/typescript-eslint/blob/master/CHANGELOG.md#​2120httpsgithubcomtypescript-eslinttypescript-eslintcomparev2110v2120-2019-12-16) [Compare Source](https://togithub.com/typescript-eslint/typescript-eslint/compare/v2.11.0...v2.12.0) ##### Bug Fixes - **eslint-plugin:** [prefer-null-coal] fixer w/ mixed logicals ([#​1326](https://togithub.com/typescript-eslint/typescript-eslint/issues/1326)) ([f9a9fbf](https://togithub.com/typescript-eslint/typescript-eslint/commit/f9a9fbf)) - **eslint-plugin:** [quotes] ignore backticks for interface properties ([#​1311](https://togithub.com/typescript-eslint/typescript-eslint/issues/1311)) ([3923a09](https://togithub.com/typescript-eslint/typescript-eslint/commit/3923a09)) ##### Features - **eslint-plugin:** [no-unnec-cond] check optional chaining ([#​1315](https://togithub.com/typescript-eslint/typescript-eslint/issues/1315)) ([a2a8a0a](https://togithub.com/typescript-eslint/typescript-eslint/commit/a2a8a0a))

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