From 32bf4fd7a892663acc85f5942e6cbd22658da52d Mon Sep 17 00:00:00 2001
From: Martin Hujer <mhujer@gmail.com>
Date: Fri, 30 Nov 2018 18:09:05 +0100
Subject: [PATCH] Fix deprecation for symfony/config 4.2

---
 DependencyInjection/Configuration.php | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/DependencyInjection/Configuration.php b/DependencyInjection/Configuration.php
index 7f03e05..51330f4 100644
--- a/DependencyInjection/Configuration.php
+++ b/DependencyInjection/Configuration.php
@@ -14,8 +14,14 @@ class Configuration implements ConfigurationInterface
      */
     public function getConfigTreeBuilder()
     {
-        $treeBuilder = new TreeBuilder();
-        $rootNode = $treeBuilder->root("white_october_breadcrumbs");
+        $treeBuilder = new TreeBuilder("white_october_breadcrumbs");
+
+        if (method_exists($treeBuilder, 'getRootNode')) {
+            $rootNode = $treeBuilder->getRootNode();
+        } else {
+            // BC layer for symfony/config 4.1 and older
+            $rootNode = $treeBuilder->root("white_october_breadcrumbs");
+        }
 
         $rootNode->
             children()->