Update dependency @typescript-eslint/typescript-estree to v3.9.1

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
@typescript-eslint/typescript-estree	dependencies	patch	3.9.0 -> 3.9.1

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Release Notes

typescript-eslint/typescript-eslint

### [`v3.9.1`](https://togithub.com/typescript-eslint/typescript-eslint/blob/master/CHANGELOG.md#​391-httpsgithubcomtypescript-eslinttypescript-eslintcomparev390v391-2020-08-17) [Compare Source](https://togithub.com/typescript-eslint/typescript-eslint/compare/v3.9.0...v3.9.1) ##### Bug Fixes - **eslint-plugin:** [no-unnecessary-condition] fix false positive with nullish coalescing ([#​2385](https://togithub.com/typescript-eslint/typescript-eslint/issues/2385)) ([092c969](https://togithub.com/typescript-eslint/typescript-eslint/commit/092c96967fd9b58fb2d8d325e1dbc750ccbeb746)) - **eslint-plugin:** [prefer-includes] don't auto fix when `test` method's argument type doesn't have an 'includes' method ([#​2391](https://togithub.com/typescript-eslint/typescript-eslint/issues/2391)) ([71c4c72](https://togithub.com/typescript-eslint/typescript-eslint/commit/71c4c729e90e308e0afd70af7db5e9d9ff238527))

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