feat: throw error when multiple versions specified (pnpm#122)

* Throw error when multiple versions specified

* fix: fmt

* fix: fmt

* Swallow error on ENOENT

* Match versions

* refactor: install pnpm

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Co-authored-by: Khải <hvksmr1996@gmail.com>
Co-authored-by: Zoltan Kochan <z@kochan.io>

Author: 3 people