Merge pull request #8 from mxschll/master

Update php.yml

Author: mxschll

.github/workflows/php.yml

@@ -25,6 +25,12 @@ jobs:
     steps:
     - uses: actions/checkout@v2
 
+    - name: Set up PHP
+      uses: shivammathur/setup-php@v2
+      with:
+        php-version: ${{ matrix.php }}
+        coverage: pcov
+
     - name: Validate composer.json and composer.lock
       run: composer validate