Migrate Travis to GitHub Actions

.github/workflows/continuous-integration.yml

@@ -0,0 +1,57 @@
+name: Continuous Integration
+
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        operating-system:
+          - ubuntu-latest
+        php-version:
+          - '5.6'
+          - '7.0'
+          - '7.1'
+          - '7.2'
+          - '7.3'
+          - '7.4'
+          - '8.0'
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v1
+
+      - name: Setup PHP ${{ matrix.php-version }}
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php-version }}
+          coverage: none
+          tools: none
+          ini-values: assert.exception=1, zend.assertions=1
+
+      - name: Get composer cache directory
+        id: composer-cache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
+      - name: Cache dependencies
+        uses: actions/cache@v2
+        with:
+          path: ${{ steps.composer-cache.outputs.dir }}
+          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
+          restore-keys: ${{ runner.os }}-composer-
+
+      - name: Install dependencies (5.6 and 7.x)
+        if: ${{ matrix.php-version != '8.0' }}
+        run: composer install --no-interaction --prefer-dist
+
+      - name: Install dependencies (8.0)
+        if: ${{ matrix.php-version == '8.0' }}
+        run: composer install --no-interaction --prefer-dist --ignore-platform-req=php
+
+      - name: Run test suite
+        run: ./vendor/bin/phpunit

.scrutinizer.yml

@@ -1,10 +1,8 @@
+build:
+    nodes:
+        analysis:
+            tests:
+                override:
+                    - php-scrutinizer-run
 filter:
     paths: ["src/*"]
-tools:
-    external_code_coverage: true
-    php_code_coverage: true
-    php_sim: true
-    php_mess_detector: true
-    php_pdepend: true
-    php_analyzer: true
-    php_cpd: true