docs: update README version shield

[AndyTWF]

The version shield still points at an old version and requires manual updating. This change replaces it with a self-updating badge that points to the GitHub release.

Summary by CodeRabbit

• Documentation
  • Updated the version badge in the SDK's documentation to display the GitHub release version.
  • Enhanced clarity of the version information presented to users without affecting functionality.

[coderabbitai]

Walkthrough

This pull request updates the version badge in the README.md file. The previous badge displaying "0.1.0-SNAPSHOT" has been replaced with a badge that indicates the GitHub release version of the Ably Chat SDK. No functional changes or modifications to exported entities were made.

Changes

File(s)	Change Summary
README.md	Updated the version badge from "0.1.0-SNAPSHOT" (with a specific shield format) to a GitHub Release badge with a new source URL and alternate text.

Possibly related PRs

• [ECO-5102] Updated README #166: Involved updates to the README, including structural enhancements and badge updates, which correlate with the changes in this pull request.

Suggested reviewers

• umair-ably
• maratal

Poem

Hopping through docs with a joyful beat,
I swapped the badge to make it neat.
A GitHub Release now shines in sight,
Guiding coders with its vibrant light.
From one rabbit’s hop to another’s cheer,
Celebrate the changes—our doc is clear!
🐇✨

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Reviewing files that changed from the base of the PR and between b8937a9 and ebb2b90.

📒 Files selected for processing (1)

• README.md (1 hunks)

✅ Files skipped from review due to trivial changes (1)

• README.md

⏰ Context from checks skipped due to timeout of 90000ms (11)

• GitHub Check: Example app, tvOS (Xcode 16)
• GitHub Check: Example app, iOS (Xcode 16)
• GitHub Check: Xcode, release configuration, tvOS (Xcode 16)
• GitHub Check: Xcode, tvOS (Xcode 16)
• GitHub Check: Example app, macOS (Xcode 16)
• GitHub Check: Xcode, iOS (Xcode 16)
• GitHub Check: SPM (Xcode 16)
• GitHub Check: Xcode, release configuration, iOS (Xcode 16)
• GitHub Check: Xcode, macOS (Xcode 16)
• GitHub Check: Xcode, release configuration, macOS (Xcode 16)
• GitHub Check: SPM, release configuration (Xcode 16)

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