Add a line after PHPDoc annotations

Author: dunglas

src/SchemaOrgModel/AnnotationGenerator/PhpDocAnnotationGenerator.php

@@ -64,6 +64,7 @@ public function generateFieldAnnotations($className, $fieldName)
             $this->toPhpType($field),
             $annotations[0]
         );
+        $annotations[] = '';
 
         return $annotations;
     }