README: fix spacing

Author: TomasVotruba

README.md

@@ -50,14 +50,14 @@ includes:
 
 You have to provide a path to `srcDevDebugProjectContainer.xml` or similar XML file describing your container.
 
-```
+```yaml
 parameters:
     symfony:
         container_xml_path: %rootDir%/../../../var/cache/dev/srcDevDebugProjectContainer.xml
         # or with Symfony 4.2+
         container_xml_path: '%rootDir%/../../../var/cache/dev/srcApp_KernelDevDebugContainer.xml'
-	# or with Symfony 5+
-	container_xml_path: '%rootDir%/../../../var/cache/dev/App_KernelDevDebugContainer.xml'
+        # or with Symfony 5+
+        container_xml_path: '%rootDir%/../../../var/cache/dev/App_KernelDevDebugContainer.xml'
 ```
 
 ## Constant hassers