Update dependency eslint-config-prettier to v6.11.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
eslint-config-prettier	devDependencies	minor	6.10.1 -> 6.11.0

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Release Notes

prettier/eslint-config-prettier

### [`v6.11.0`](https://togithub.com/prettier/eslint-config-prettier/blob/master/CHANGELOG.md#Version-6110-2020-04-21) [Compare Source](https://togithub.com/prettier/eslint-config-prettier/compare/v6.10.1...v6.11.0) - Added: [@​typescript-eslint/keyword-spacing]. Thanks to Hans Bergren ([@​hbergren](https://togithub.com/hbergren))!

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