Update dependency prettier to v2

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
prettier (source)	devDependencies	major	^1.19.1 -> ^2.0.0

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Release Notes

prettier/prettier

### [`v2.0.1`](https://togithub.com/prettier/prettier/blob/master/CHANGELOG.md#​201) [Compare Source](https://togithub.com/prettier/prettier/compare/2.0.0...2.0.1) [diff](https://togithub.com/prettier/prettier/compare/2.0.0...2.0.1) ##### API: Fix build script to not corrupt `import-fresh` module ([#​7820](https://togithub.com/prettier/prettier/pull/7820) by [@​thorn0](https://togithub.com/thorn0)) ### [`v2.0.0`](https://togithub.com/prettier/prettier/blob/master/CHANGELOG.md#​200) [Compare Source](https://togithub.com/prettier/prettier/compare/1.19.1...2.0.0) [diff](https://togithub.com/prettier/prettier/compare/1.19.1...2.0.0) 🔗 [Release Notes](https://prettier.io/blog/2020/03/21/2.0.0.html)

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