Drop EOL Rubies support.

.github/workflows/ruby.yml

@@ -22,17 +22,14 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby-version: ['2.6', '2.7', '3.0']
+        ruby-version: ['3.1', '3.2', '3.3']
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Set up Ruby
-    # To automatically get bug fixes and new Ruby versions for ruby/setup-ruby,
-    # change this to (see https://github.com/ruby/setup-ruby#versioning):
-    # uses: ruby/setup-ruby@v1
-      uses: ruby/setup-ruby@2b019609e2b0f1ea1a2bc8ca11cb82ab46ada124
+      uses: ruby/setup-ruby@v1
       with:
         ruby-version: ${{ matrix.ruby-version }}
-        bundler-cache: true # runs 'bundle install' and caches installed gems automatically
+        bundler-cache: true
     - name: Run tests
       run: bundle exec rake

README.md

@@ -1,4 +1,4 @@
-## xxHash [![Build Status](https://travis-ci.org/nashby/xxhash.png?branch=master)](https://travis-ci.org/nashby/xxhash)
+## xxHash [![Ruby](https://github.com/nashby/xxhash/actions/workflows/ruby.yml/badge.svg)](https://github.com/nashby/xxhash/actions/workflows/ruby.yml)
 
 Ruby wrapper for [xxHash](https://github.com/Cyan4973/xxHash)
 
@@ -37,8 +37,7 @@ XXH64 is also supported: you can use `xxh64`, `xxh64_stream`, `.xxh64_file`.
 
 ### Supported Ruby versions
 
-- MRI 2.3+
-- rbx-19mode
+- MRI 3.1+
 
 Note: It doesn't work on JRuby as it uses C extension.