Update dependency prettier to v2.0.4

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
prettier (source)	devDependencies	patch	2.0.3 -> 2.0.4

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Release Notes

prettier/prettier

### [`v2.0.4`](https://togithub.com/prettier/prettier/blob/master/CHANGELOG.md#​204) [Compare Source](https://togithub.com/prettier/prettier/compare/2.0.3...2.0.4) [diff](https://togithub.com/prettier/prettier/compare/2.0.3...2.0.4) ##### Revert [#​7869](https://togithub.com/prettier/prettier/pull/7869), "[TypeScript] format TSAsExpression with same logic as BinaryExpression" ([#​7958](https://togithub.com/prettier/prettier/pull/7958))

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