chore(deps): 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	6.12.0 -> 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]. 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)!

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