@hono/zod-validator - Update README.md to include an example with a custom validator wrapper for improved type inference

[farhadham]

Summary

This PR updates the README.md file to include a custom zValidator wrapper example that improves type inference for validated data.

Changes Made

• Added a new section titled "Custom Wrapper for Improved Type Inference".
• Included an example of a generic wrapper that leverages TypeScript generics to ensure correct type inference.

Related Issue

Closes #921.

Checklist

• Documentation updated.
• Ready for review.

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Latest commit: 56d9d64

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[yusukebe]

I think you can write this line more simply because the default value of Target is not needed:

export const zValidator = <T extends ZodSchema, Target extends keyof ValidationTargets>(
  target: Target,
  schema: T
) =>
  zv(target, schema, (result, c) => {
    if (!result.success) {
      throw new HTTPException(400, { cause: result.error })
    }
  })

[farhadham]

@yusukebe You are right!
Thank you for your help, I committed the change

[yusukebe]

LGTM!

[yusukebe]

@farhadham

Thank you! I'll merge it.