bug: version 1.12.0 doesn't seem to bring pnpm support

[cguy]

Hi!

Thank you for your helpful library.

I have an issue with your last version which claims to support pnpm. Well, it doesn't, we I look into source code of your 1.12.0 tag, pnpm reference is missing: https://github.com/mohlsen/check-engine/blob/v1.12.0/lib/validatorRules.js

Could you please create a new release?

Best regards,