Drop support for Ruby 2.5 and 2.6

Author: horgh

.github/workflows/test.yml

@@ -15,8 +15,6 @@ jobs:
         os: [ubuntu-latest, windows-latest, macos-latest]
         version:
           [
-            2.5,
-            2.6,
             2.7,
             '3.0',
             3.1,

.rubocop.yml

@@ -1,5 +1,5 @@
 AllCops:
-    TargetRubyVersion: 2.5
+    TargetRubyVersion: 2.7
     NewCops: enable
 
 # Metrics.

CHANGELOG.md

@@ -1,5 +1,10 @@
 # Changelog
 
+## v2.4.0
+
+* Ruby 2.7+ is now required. If you're using Ruby 2.5 or 2.6, please use
+  version 2.3.0 of this gem.
+
 ## v2.3.0 (2023-12-04)
 
 * Added the processor `:shopify_payments` to `Minfraud::Components::Payment`.

README.md

@@ -275,7 +275,7 @@ to the client API, please see
 
 ## Requirements
 
-This gem works with Ruby 2.5 and above.
+This gem works with Ruby 2.7 and above.
 
 ## Contributing
 

minfraud.gemspec

@@ -15,7 +15,7 @@ Gem::Specification.new do |spec|
   spec.homepage      = 'https://github.com/maxmind/minfraud-api-ruby'
   spec.license       = 'MIT'
 
-  spec.required_ruby_version = '>= 2.5.0'
+  spec.required_ruby_version = '>= 2.7.0'
 
   spec.files         = `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(test|spec|features)/}) }
   spec.bindir        = 'exe'