Update Prettier configuration

[atomist[bot]]

Update Prettier repository configuration to skill configuration.

This pull request configures support for applying Prettier formatting rules on every commit locally by using a Git pre-commit hook. The pre-commit hook will only format staged files. To apply the formatting rules across your entire repository, run:

$ npm run atm:lint:prettier --- '**/*.@(graphql|json|markdown|yaml|yml|md)'

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File changed:

• .prettierrc.json

[atomist[bot]]

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