docs: fix inaccuracies in README

[jonathannorris]

Summary

• Fix minor accuracy issues in the README

Changes

1. Quick start: Removed unused require 'json' # For JSON.dump line. The comment claims it's for JSON.dump, but no JSON.dump (or any other JSON method) is called anywhere in the quick start code block
2. fetch_boolean_details comment: Fixed # see ResolutionDetails for more info to EvaluationDetails. The fetch_*_details methods return an EvaluationDetails instance (which wraps a ResolutionDetails internally), not a ResolutionDetails directly

[gemini-code-assist]

Code Review

This pull request updates the README.md by restricting the supported OS list to Linux, removing an unnecessary JSON requirement from a code example, and updating a class reference. Feedback indicates that the OS restriction might be misleading if the SDK remains compatible with other platforms, and the change from ResolutionDetails to EvaluationDetails appears to introduce a documentation inaccuracy as it contradicts the existing implementation and tests.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.50%. Comparing base (5ed5a71) to head (80fc4d3).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #274   +/-   ##
=======================================
  Coverage   99.50%   99.50%           
=======================================
  Files          31       31           
  Lines         808      808           
=======================================
  Hits          804      804           
  Misses          4        4           

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[Copilot]

Pull request overview

This PR updates the repository’s README to better reflect current behavior and terminology in the Ruby SDK.

Changes:

• Update the requirements table OS column to reflect Linux-only CI verification.
• Remove an unused require 'json' line from the quick start snippet.
• Update the detailed-evaluation comment to reference EvaluationDetails instead of ResolutionDetails.

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