chore: actually test other php versions

.github/workflows/test.yml

@@ -11,14 +11,26 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        php: [7.1, 8.0]
+        php: [7.1, 7.3]
         illuminate_version: [5.8.*, 6.*, 7.*]
         composer_flags:  ['', '--prefer-lowest']
+        exclude:
+          - php: 7.1
+            illuminate_version: 6.*
+          - php: 7.1
+            illuminate_version: 7.*
 
     name: PHP ${{ matrix.php }} | Illuminate ${{ matrix.illuminate_version }} | Composer Flags ${{ matrix.composer_flags }}
 
     steps:
-    - uses: actions/checkout@v2
+    - name: Checkout code
+      uses: actions/checkout@v2
+
+    - name: Setup PHP
+      uses: shivammathur/setup-php@v2
+      with:
+        php-version: ${{ matrix.php }}
+        coverage: none
 
     - name: Install dependencies
       run: |