switch from travis to github workflows

.github/workflows/php.yml

@@ -0,0 +1,42 @@
+name: PHP Composer
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        php-versions: ["7.2", "7.3", "7.4", "8.0"]
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Setup PHP, with composer and extensions
+        uses: shivammathur/setup-php@v2 #https://github.com/shivammathur/setup-php
+        with:
+          php-version: ${{ matrix.php-versions }}
+          extensions: mbstring, simplexml, dom, curl
+          coverage: pcov
+
+      - name: Validate composer.json and composer.lock
+        run: composer validate --strict
+
+      - name: Cache Composer packages
+        id: composer-cache
+        uses: actions/cache@v2
+        with:
+          path: vendor
+          key: ${{ runner.os }}-php-${{ hashFiles('**/composer.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-php-
+            
+      - name: Install dependencies
+        run: composer update --prefer-dist --no-progress
+
+      - name: Run test suite
+        run: composer run-script test

.travis.yml

@@ -1,14 +0,0 @@
-language: php
-php:
-- 5.5
-- 5.6
-- 7.0
-- 7.1
-- 7.2
-- nightly
-matrix:
-  allow_failures:
-    - php: nightly
-before_script: composer install
-services:
-  - redis-server