Update to drupal 8.0.0-rc1. For more information, see https://www.drupal.org/node/2582663

vendor/symfony-cmf/routing/CHANGELOG.md

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+Changelog
+=========
+
+* **2014-09-29**: ChainRouter does not require a RouterInterface, as a
+  RequestMatcher and UrlGenerator is fine too. Fixed chain router interface to
+  not force a RouterInterface.
+* **2014-09-29**: Deprecated DynamicRouter::match in favor of matchRequest.
+
+1.3.0-RC1
+---------
+
+* **2014-08-20**: Added an interface for the ChainRouter
+* **2014-06-06**: Updated to PSR-4 autoloading
+
+1.2.0
+-----
+
+Release 1.2.0
+
+1.2.0-RC1
+---------
+
+* **2013-12-23**: add support for ChainRouter::getRouteCollection()
+* **2013-01-07**: Removed the deprecated $parameters argument in
+  RouteProviderInterface::getRouteByName and getRoutesByNames.
+
+1.1.0
+-----
+
+Release 1.1.0
+
+1.1.0-RC1
+---------
+
+* **2013-07-31**: DynamicRouter now accepts an EventDispatcher to trigger a
+  RouteMatchEvent right before the matching starts
+* **2013-07-29**: Renamed RouteAwareInterface to RouteReferrersReadInterface
+  for naming consistency and added RouteReferrersInterface for write access.
+* **2013-07-13**: NestedMatcher now expects a FinalMatcherInterface as second
+  argument of the constructor
+
+1.1.0-alpha1
+------------
+
+* **2013-04-30**: Dropped Symfony 2.1 support and got rid of
+  ConfigurableUrlMatcher class
+* **2013-04-05**: [ContentAwareGenerator] Fix locale handling to always respect
+  locale but never have unnecessary ?locale=