bug #1596 Updated for RouterListener from symfony/http-kernel v3.4+ (ProgMiner)

This PR was merged into the 2.2.x-dev branch.

Discussion
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Updated for RouterListener from symfony/http-kernel v3.4+

#1591

Commits
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45c44271 #1591

src/Silex/Provider/RoutingServiceProvider.php

@@ -76,7 +76,7 @@ class RoutingServiceProvider implements ServiceProviderInterface, EventListenerP
                 return $app['request_matcher'];
             });
 
-            return new RouterListener($urlMatcher, $app['request_stack'], $app['request_context'], $app['logger']);
+            return new RouterListener($urlMatcher, $app['request_stack'], $app['request_context'], $app['logger'], null, isset($app['debug']) ? $app['debug'] : false);
         };
     }