CI: Add GitHub Actions, drop TravisCI

.github/workflows/ci.yml

@@ -0,0 +1,26 @@
+name: Ruby CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  test:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        ruby-version: ["3.3", "3.2", "3.1", "3.0", "2.7", "jruby-head", "ruby-head"]
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Ruby ${{ matrix.ruby-version }}
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby-version }}
+          bundler-cache: true # runs 'bundle install' and caches installed gems automatically
+      - name: Run tests
+        run: bundle exec rake

README.md

@@ -2,13 +2,13 @@
 [stable]: https://github.com/carr/phone/tree/v1.2.3
 [gem-beta]: https://rubygems.org/gems/phone/versions/1.3.0.beta1
 [beta]: https://github.com/carr/phone/tree/v1.3.0.beta1/
-[travis]: https://travis-ci.org/carr/phone
+[ci]: https://github.com/carr/phone/actions/workflows/ci.yml
 
 # phone
 
 [![Beta Gem Version](https://img.shields.io/badge/beta-v1.3.0.beta1-blue.svg)][gem-beta]
 [![Gem Version](https://img.shields.io/gem/v/phone.svg)][gem]
-[![Build Status](https://img.shields.io/travis/carr/phone.svg)][travis]
+[![Build Status](https://github.com/carr/phone/actions/workflows/ci.yml/badge.svg)][ci]
 
 Parsing, validating and creating phone numbers