Add back Ruby 2.7

Author: alexrudall

.circleci/config.yml

@@ -38,6 +38,7 @@ workflows:
           matrix:
             parameters:
               ruby-image:
+                - cimg/ruby:2.7-node
                 - cimg/ruby:3.0-node
                 - cimg/ruby:3.1-node
                 - cimg/ruby:3.2-node

CHANGELOG.md

@@ -15,6 +15,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - [BREAKING] Backwards compatibility for `require "ruby/openai"` is removed - from v8 on you MUST use `require "openai"`. This fixes a deprecation warning with Ruby 3.4. Thanks to [@ndemianc](https://github.com/ndemianc) for this PR.
 
+### Removed
+
+- [BREAKING] Removed support for Ruby 2.6. ruby-openai may still work with this version but it's no longer supported.
+
 ## [7.4.0] - 2024-02-10
 
 ### Added