readme: add missing v22 to gen5_records listing

[abdulsaheel]

readme said v18/v20/v21/v26 for gen5_records.dart but v22 is in there too (exported, in dispatch, has its own test file). just fixing the doc.

Summary by Sourcery

Documentation:

• Update the gen5_records decoder listing to include the v22 record format.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This documentation-only change updates the README to accurately list v22 alongside the existing gen5_records decoder versions, with no code or behavior changes.

File-Level Changes

Change	Details	Files
Correct the README’s gen5_records decoder version listing to include v22.	Add v22 to the documented sequence of supported historical record decoders.	README.md

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Hey - I've reviewed your changes and they look great!

Sourcery assessment

Approved.

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[abdulsaheel]

squashed into #42 for one clean review — closing this round.