chore(deps): update prettier to v1.19.1

[renovate[bot]]

This PR contains the following updates:

Package	Update	Type	Change	Sourcegraph
prettier (source)	patch	devDependencies	1.19.0 -> 1.19.1

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Release Notes

prettier/prettier

### [`v1.19.1`](https://togithub.com/prettier/prettier/blob/master/CHANGELOG.md#​1191) [Compare Source](https://togithub.com/prettier/prettier/compare/1.19.0...1.19.1) [diff](https://togithub.com/prettier/prettier/compare/1.19.0...1.19.1) ##### CLI ##### Fix `--stdin` regression in 1.19.0 ([#​6894](https://togithub.com/prettier/prettier/pull/6894) by [@​lydell](https://togithub.com/lydell)) // Prettier stable $ echo "test" | prettier --stdin --parser babel [error] regeneratorRuntime is not defined // Prettier master $ echo "test" | prettier --stdin --parser babel test; ##### TypeScript ##### Fix formatting of union type as arrow function return type ([#​6896](https://togithub.com/prettier/prettier/pull/6896) by [@​thorn0](https://togithub.com/thorn0)) ```jsx // Input export const getVehicleDescriptor = async ( vehicleId: string, ): Promise => {} // Prettier stable export const getVehicleDescriptor = async ( vehicleId: string ): Promise<| Collections.Parts.PrintedCircuitBoardAssembly["attributes"] | undefined> => {}; // Prettier master export const getVehicleDescriptor = async ( vehicleId: string ): Promise< Collections.Parts.PrintedCircuitBoardAssembly["attributes"] | undefined > => {}; ```

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