Enable coverage

Author: nicekiwi

.github/workflows/php.yml

@@ -18,9 +18,10 @@ jobs:
       - uses: actions/checkout@v2
 
       - name: Setup PHP
-        uses: nanasess/setup-php@master
+        uses: shivammathur/setup-php@v2
         with:
           php-version: ${{ matrix.php }}
+          coverage: pcov
 
       - name: PHP ${{ matrix.php }} - Validate composer.json and composer.lock
         run: composer validate