Added double check (#42)

Author: staabm

.github/workflows/csfix.yml

@@ -18,6 +18,8 @@ jobs:
       uses: shivammathur/setup-php@v1
       with:
         php-version: 7.0
+        coverage: none # disable xdebug, pcov
+        tools: cs2pr
 
     - name: "Install dependencies with composer"
       run: "composer install --no-interaction --no-progress --no-suggest"
@@ -31,3 +33,5 @@ jobs:
         branch: ${{ github.head_ref }}
       env:
         GITHUB_TOKEN: ${{ secrets.STAABM_TOKEN }}
+        
+    - run: vendor/bin/php-cs-fixer fix --diff --dry-run --format=checkstyle | cs2pr # check whether there are still errors left