Dropped support for Ruby < 3 [skip ci]

Author: ankane

.github/workflows/build.yml

@@ -13,8 +13,6 @@ jobs:
             os: ubuntu-20.04
           - ruby: "3.0"
             os: macos-latest
-          - ruby: 2.7
-            os: ubuntu-20.04
     steps:
       - uses: actions/checkout@v3
       - uses: ruby/setup-ruby@v1

CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.11.0 (unreleased)
+
+- Dropped support for Ruby < 3
+
 ## 0.10.1 (2023-03-20)
 
 - Added `domain` method to `SatIntVar`

or-tools.gemspec

@@ -14,7 +14,7 @@ Gem::Specification.new do |spec|
   spec.require_path  = "lib"
   spec.extensions    = ["ext/or-tools/extconf.rb"]
 
-  spec.required_ruby_version = ">= 2.7"
+  spec.required_ruby_version = ">= 3"
 
   spec.add_dependency "rice", ">= 4.1"
 end