Preciso Bid Adapter: update

[PrecisoSRL]

🏷 Type of documentation

• [ ] new bid adapter
• [x] update bid adapter
• [ ] new feature
• [ ] text edit only (wording, typos)
• [ ] bugfix (code examples)
• [ ] new examples

📋 Checklist

• [ ] Related pull requests in prebid.js or server are linked -> Paste link in this list or reference it on the PR itself
• [ ] For new adapters check submitting your adapter docs

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[PrecisoSRL]

Hi @bretg , Thank you for your review and valuable suggestions. I have added code to support native media types in the existing adapter instead of creating a new one. I have also modified the markdown files accordingly.

Thank you!