Update flipp.md - add pbjs adapter

[mike-lei]

🏷 Type of documentation

• new bid adapter
• 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 -> Flipp Bid Adapter : initial release Prebid.js#10412
• For new adapters check submitting your adapter docs

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[mike-lei]

Hey @bretg, the adapter was released today https://github.com/prebid/Prebid.js/releases/tag/8.14.0, can we also merge the docs as well? I guess we need this docs for our adapter to appear on https://docs.prebid.org/download.html? Thanks!