Move some travis builds to actions to speed up feedback (#405)

.github/workflows/ci.yml

@@ -0,0 +1,30 @@
+name: CI
+
+on:
+  pull_request:
+
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    strategy:
+      max-parallel: 10
+      matrix:
+        php: ['5.6', '7.0', '7.1', '7.2', '7.3', '7.4']
+
+    steps:
+      - name: Set up PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          coverage: 'none'
+          extensions: mbstring
+
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Install dependencies
+        run: composer update --no-interaction --no-progress --prefer-dist
+
+      - name: Run tests
+        run: make test

.travis.yml

@@ -14,20 +14,6 @@ matrix:
           env: COMPOSER_FLAGS="--prefer-stable --prefer-lowest"
         - php: 5.5
           dist: trusty
-        - php: 5.6
-          dist: xenial
-        - php: 7.0
-          dist: xenial
-        - php: 7.1
-          dist: bionic
-        - php: 7.2
-          dist: bionic
-        - php: 7.3
-          dist: bionic
-        - php: 7.4
-          dist: bionic
-        - php: 8.0
-          dist: bionic
     fast_finish: true
 
 before_install: