feat: Flutter SDK update for version 20.4.0

[ChiragAgg5k]

This PR contains updates to the Flutter SDK for version 20.4.0.

Summary by CodeRabbit

• New Features

  • Added getScreenshot method to the Avatars service.

• Chores

  • Updated version to 20.4.0 across documentation and client components.

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[coderabbitai]

Walkthrough

This pull request performs a version bump from 20.3.2 to 20.4.0 across the Flutter Dart SDK. Changes include updating the version number in pubspec.yaml, adding a changelog entry documenting a new getScreenshot method in the Avatars service, updating SDK version headers in both client implementations (browser and IO), and updating the documented dependency version in README.md.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

• All changes follow the same repetitive pattern of version number updates
• No logic changes or functional modifications
• Consistent version updates across multiple files (homogeneous changes)

Areas that may require extra attention:

• Verify the CHANGELOG.md entry accurately describes the new getScreenshot method
• Confirm all version references (pubspec.yaml, client headers, README.md) are consistent at 20.4.0

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: a version bump of the Flutter SDK to 20.4.0, which is confirmed by updates across CHANGELOG.md, pubspec.yaml, README.md, and client headers.
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 dev

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📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 948b14b and c02fead.

📒 Files selected for processing (5)

• CHANGELOG.md (1 hunks)
• README.md (1 hunks)
• lib/src/client_browser.dart (1 hunks)
• lib/src/client_io.dart (1 hunks)
• pubspec.yaml (1 hunks)

🔇 Additional comments (5)

pubspec.yaml (1)

2-2: LGTM! Clean version bump to 20.4.0.

The version update is consistent with the minor feature addition documented in the changelog (new getScreenshot method).

lib/src/client_io.dart (1)

61-61: LGTM! SDK version header correctly updated.

The x-sdk-version header now matches the package version in pubspec.yaml.

lib/src/client_browser.dart (1)

43-43: LGTM! SDK version header correctly updated.

The x-sdk-version header now matches the package version, consistent with the IO client implementation.

README.md (1)

24-24: LGTM! Documentation updated to reflect the new version.

The installation instructions now correctly reference version 20.4.0.

CHANGELOG.md (1)

3-6: Implementation verified. Changelog entry is accurate.

The getScreenshot method has been successfully implemented in the Avatars service at lib/services/avatars.dart:202 and includes corresponding test coverage at test/services/avatars_test.dart:149. The changelog entry properly documents this addition.

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