docs(readme): fix maven badge

[paodb]

Summary by CodeRabbit

• Documentation
  • Updated Maven Central artifact coordinates in project documentation to reflect new repository configuration.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

[coderabbitai]

Walkthrough

Updated the Maven Central badge in README.md to reflect new artifact coordinates, changing from com.flowingcode.vaadin.addons/json-migration-helper to com.flowingcode.vaadin/json-migration-helper. The badge link and all other content remain unchanged.

Changes

Cohort / File(s)	Change Summary
Documentation badge update README.md	Updated Maven Central badge artifact coordinates to reflect new groupId path

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

This is a straightforward documentation update involving only a badge URL/coordinate change with no logic alterations or structural modifications.

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: updating the Maven Central badge in the README.md file to reflect new artifact coordinates.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch paodb-patch-1

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📜 Recent review details

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between a814009 and 20ccd49.

📒 Files selected for processing (1)

• README.md (1 hunks)

🧰 Additional context used

🧠 Learnings (2)

📓 Common learnings

Learnt from: javier-godoy
Repo: FlowingCode/JsonMigrationHelper PR: 11
File: src/main/java/com/flowingcode/vaadin/jsonmigration/JsonSerializer.java:281-301
Timestamp: 2025-11-25T16:35:42.544Z
Learning: In the JsonMigrationHelper project, code copied from the Vaadin codebase should be kept consistent with the original source unless there's a specific reason to deviate.

📚 Learning: 2025-11-25T16:35:42.544Z

Learnt from: javier-godoy
Repo: FlowingCode/JsonMigrationHelper PR: 11
File: src/main/java/com/flowingcode/vaadin/jsonmigration/JsonSerializer.java:281-301
Timestamp: 2025-11-25T16:35:42.544Z
Learning: In the JsonMigrationHelper project, code copied from the Vaadin codebase should be kept consistent with the original source unless there's a specific reason to deviate.

Applied to files:

• README.md

🔇 Additional comments (1)

README.md (1)

4-4: Badge now reflects current artifact coordinates.

The Maven Central badge has been updated to match the correct artifact groupId (com.flowingcode.vaadin instead of com.flowingcode.vaadin.addons), bringing it into alignment with the Javadoc badge (line 5) and the pom.xml example (lines 29–31). This is a good consistency fix.

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