Provide a 'Changelog' link on rubygems.org/gems/database_cleaner-active_record (#114)

* Provide a 'Changelog' link on rubygems.org/gems/database_cleaner-active_record

By providing a 'changelog_uri' in the metadata of the gemspec a
'Changelog' link will be shown on https://rubygems.org/gems/database_cleaner-active_record
which makes it quick and easy for someone to check on the changes
introduced with a new version.

Details of this functionality can be found on https://guides.rubygems.org/specification-reference/

* Put an entry in Changelog

---------

Co-authored-by: Ernesto Tagwerker <[email protected]>

Author: mark-young-atg

CHANGELOG.md

@@ -1,5 +1,6 @@
 # Development (unreleased)
 
+* Provide a 'Changelog' link on Rubygems: https://github.com/DatabaseCleaner/database_cleaner-active_record/pull/114
 * Fix bundling and CONTRIBUTE.md instructions: https://github.com/DatabaseCleaner/database_cleaner-active_record/pull/123
 
 ## v2.2.1 2025-05-13
@@ -27,4 +28,4 @@
 
 * Add Ruby 3.2 to CI matrix: https://github.com/DatabaseCleaner/database_cleaner-active_record/pull/79
 * Add Rails 7.1 support: https://github.com/DatabaseCleaner/database_cleaner-active_record/pull/78
-* Add WHERE clause to make `ruby-spanner-activerecord` happy: https://github.com/DatabaseCleaner/database_cleaner-active_record/pull/77
+* Add WHERE clause to make `ruby-spanner-activerecord` happy: https://github.com/DatabaseCleaner/database_cleaner-active_record/pull/77

database_cleaner-active_record.gemspec

@@ -29,4 +29,6 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "pg"
   spec.add_development_dependency "sqlite3"
   spec.add_development_dependency "trilogy"
+
+  spec.metadata["changelog_uri"] = spec.homepage + "/blob/main/CHANGELOG.md"
 end