Update package.json

[cbbfcd]

Remove unused dependencies.

What kind of change does this PR introduce?

Did you add tests for your changes?

Summary

Does this PR introduce a breaking change?

Other information

Please paste the results of preact info here.

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Latest commit: 30e8d0b

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[rschristian]

Thanks but Preact-CLI is no longer maintained, as stated in the readme.