Fix processorOptions configuration

Author: agentsib

CHANGELOG.md

@@ -5,6 +5,8 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Fixed
+ - Fix `processorOptions` in yaml configuration
 
 ## 2.0.1 - 2018-01-31
 ### Fixed

src/DependencyInjection/Configuration.php

@@ -107,7 +107,9 @@ public function getConfigTreeBuilder()
                             ->prototype('scalar')->end()
                         ->end()
                         ->arrayNode('processorOptions')
-                            ->prototype('scalar')->end()
+                            ->arrayPrototype()
+                                ->prototype('scalar')->end()
+                            ->end()
                         ->end()
                     ->end()
                 ->end();