Update README.md - Add Irys plugin

[ofemeteng]

Update README.md to show Irys plugin

Relates to:

PR 430

Background

What does this PR do?

This PR updates the readme of goat-sdk to reflect the addition of the new Irys plugin. See PR 430 for the merge triggering this documentation update - #430

Testing

Detailed testing results

Method	Prompt	Screenshot	Transaction Link
Action #1	Prompt to get it to take that action	Screenshot of the result	Transaction link
Action #2	Prompt to get it to take that action	Screenshot of the result	Transaction link

Docs

Checklist

• I have tested this change and added the relevant screenshots to the PR description
• I updated the README if necessary to include the new plugin, wallet, chain, etc.

[changeset-bot]

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Latest commit: e371162

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