Drop support for 3.1

Author: mattt

.github/workflows/ci.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby-version: ["3.1", "3.2", "3.3", "3.4"]
+        ruby-version: ["3.2", "3.3", "3.4"]
 
     steps:
       - uses: actions/checkout@v2

packageurl-ruby.gemspec

@@ -17,7 +17,7 @@ Gem::Specification.new do |spec|
   DESCRIPTION
 
   spec.homepage = 'https://github.com/package-url/packageurl-ruby'
-  spec.required_ruby_version = Gem::Requirement.new('>= 3.1.0')
+  spec.required_ruby_version = Gem::Requirement.new('>= 3.2.0')
 
   spec.license = 'MIT'
   spec.metadata['homepage_uri'] = spec.homepage