fix glob pattern on windows

[matheuspuel]

glob expects / as a path separator instead of \ (the windows separator).

Closes #53

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Latest commit: ec7d3c14307da9f80171eb7cd0aea7b59025ffac

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| Name | Type | | -------------- | ----- | | @effect/docgen | Patch |

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[gcanti]

Thanks @matheuspuel