feat: added better support for 'valid'

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (29318e0) 98.61% compared to head (735eae0) 98.62%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #320 +/- ## ======================================= Coverage 98.61% 98.62% ======================================= Files 9 9 Lines 505 508 +3 Branches 192 194 +2 ======================================= + Hits 498 501 +3 Misses 7 7 ``` | [Impacted Files](https://codecov.io/gh/mrjono1/joi-to-typescript/pull/320?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | Coverage Δ | | |---|---|---| | [src/parse.ts](https://codecov.io/gh/mrjono1/joi-to-typescript/pull/320?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-c3JjL3BhcnNlLnRz) | `97.22% <100.00%> (+0.03%)` | :arrow_up: | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None)

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