Expand Ruby support to include Ruby 2.6 and newer

Author: jgarber623

.github/workflows/ci.yml

@@ -24,7 +24,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: ["3.0", "3.1", "3.2", "3.3"]
+        ruby: ["2.6", "2.7", "3.0", "3.1", "3.2", "3.3"]
     steps:
       - uses: actions/checkout@v4
       - uses: ruby/setup-ruby@v1

README.md

@@ -15,7 +15,7 @@
 
 ## Getting Started
 
-Before installing and using webmention-client-ruby, you'll want to have [Ruby](https://www.ruby-lang.org) 3.0 (or newer) installed. Using a Ruby version managment tool like [rbenv](https://github.com/rbenv/rbenv), [chruby](https://github.com/postmodern/chruby), or [rvm](https://github.com/rvm/rvm) is recommended.
+Before installing and using webmention-client-ruby, you'll want to have [Ruby](https://www.ruby-lang.org) 2.6 (or newer) installed. Using a Ruby version managment tool like [rbenv](https://github.com/rbenv/rbenv), [chruby](https://github.com/postmodern/chruby), or [rvm](https://github.com/rvm/rvm) is recommended.
 
 webmention-client-ruby is developed using Ruby 3.4 and is tested against additional Ruby versions using [GitHub Actions](https://github.com/indieweb/webmention-client-ruby/actions).
 

webmention.gemspec

@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 Gem::Specification.new do |spec|
-  spec.required_ruby_version = ">= 3.0"
+  spec.required_ruby_version = ">= 2.6"
 
   spec.name = "webmention"
   spec.version = "8.0.0"
@@ -29,6 +29,6 @@ Gem::Specification.new do |spec|
   }
 
   spec.add_dependency "http", "~> 5.2"
-  spec.add_dependency "indieweb-endpoints", "~> 9.0"
-  spec.add_dependency "nokogiri", ">= 1.16"
+  spec.add_dependency "indieweb-endpoints", "~> 9.1"
+  spec.add_dependency "nokogiri", ">= 1.13"
 end