add method rename

config/level/guzzle/guzzle50.yml

@@ -18,4 +18,8 @@ services:
     Rector\Rector\StaticCall\StaticCallToFunctionRector:
         'GuzzleHttp\Utils::setPath': 'GuzzleHttp\set_path'
         'GuzzleHttp\Pool::batch': 'GuzzleHttp\Pool\batch'
+
     Rector\Guzzle\Rector\FuncCall\MessageAsArrayRector: ~
+    Rector\Rector\MethodCall\MethodNameReplacerRector:
+        GuzzleHttp\Message\MessageInterface:
+            getHeaderLines: 'getHeaderAsArray'

packages/ContributorTools/src/Configuration/ConfigurationFactory.php

@@ -41,7 +41,7 @@ final class ConfigurationFactory
             $config['description'],
             $config['code_before'],
             $config['code_after'],
-            $this->resolveSource($config['source']),
+            (array) $config['source'],
             $this->resolveLevelConfig($config['level'])
         );
     }
@@ -163,13 +163,4 @@ final class ConfigurationFactory
         $foundLevelConfigFileInfo = array_pop($fileInfos);
         return $foundLevelConfigFileInfo->getRealPath();
     }
-
-    /**
-     * @param string|string[] $source
-     * @return string[]
-     */
-    private function resolveSource($source): array
-    {
-        return (array) $source;
-    }
 }