Migrate the tests from Travis CI to GitHub Actions

.github/workflows/tests.yml

@@ -0,0 +1,32 @@
+name: Run Tests
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        php-version: [7.1, 7.2, 7.3, 7.4]
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v2
+
+    - name: Set up PHP
+      uses: shivammathur/setup-php@v2
+      with:
+        php-version: ${{ matrix.php-version }}
+
+    - name: Install dependencies
+      run: composer install --prefer-source --no-interaction --dev
+
+    - name: Run tests
+      run: vendor/bin/phpunit

README.md

@@ -1,6 +1,6 @@
 # Disable Comments for WordPress
 
-[![Build Status](https://travis-ci.org/solarissmoke/disable-comments.svg?branch=master)](https://travis-ci.org/solarissmoke/disable-comments)
+[![Build Status](https://github.com/WPDevelopers/disable-comments/actions/workflows/tests.yml/badge.svg)](https://github.com/WPDevelopers/disable-comments/actions/workflows/tests.yml)
 
 This is the development respository for the [Disable Comments](https://wordpress.org/plugins/disable-comments/) WordPress plugin. Send pull requests here, download the latest stable version there!