Update dependency eslint-config-prettier to v6.15.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
eslint-config-prettier	^6.11.0 -> 6.15.0

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Release Notes

prettier/eslint-config-prettier

### [`v6.15.0`](https://togithub.com/prettier/eslint-config-prettier/blob/master/CHANGELOG.md#Version-6150-2020-10-27) [Compare Source](https://togithub.com/prettier/eslint-config-prettier/compare/v6.14.0...v6.15.0) - Added: \[[@​typescript-eslint/space-infix-ops](https://togithub.com/typescript-eslint/space-infix-ops)]. Thanks to Masafumi Koba ([@​ybiquitous](https://togithub.com/ybiquitous))! ### [`v6.14.0`](https://togithub.com/prettier/eslint-config-prettier/blob/master/CHANGELOG.md#Version-6140-2020-10-21) [Compare Source](https://togithub.com/prettier/eslint-config-prettier/compare/v6.13.0...v6.14.0) - Added: New \[eslint-plugin-vue] rules: \[vue/array-bracket-newline] and \[vue/block-tag-newline]. Thanks to [@​xcatliu](https://togithub.com/xcatliu)! ### [`v6.13.0`](https://togithub.com/prettier/eslint-config-prettier/blob/master/CHANGELOG.md#Version-6130-2020-10-16) [Compare Source](https://togithub.com/prettier/eslint-config-prettier/compare/v6.12.0...v6.13.0) - Added: New rules in \[eslint-plugin-vue] 7.0 (which supports Vue 3.0). Thanks to [@​xcatliu](https://togithub.com/xcatliu)! ### [`v6.12.0`](https://togithub.com/prettier/eslint-config-prettier/blob/master/CHANGELOG.md#Version-6120-2020-09-25) [Compare Source](https://togithub.com/prettier/eslint-config-prettier/compare/v6.11.0...v6.12.0) - Added: \[[@​typescript-eslint/comma-dangle](https://togithub.com/typescript-eslint/comma-dangle)]. Thanks to Masafumi Koba ([@​ybiquitous](https://togithub.com/ybiquitous))!

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