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

vendor/symfony/http-kernel/CHANGELOG.md

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+CHANGELOG
+=========
+
+2.7.0
+-----
+
+ * added the HTTP status code to profiles
+
+2.6.0
+-----
+
+ * deprecated `Symfony\Component\HttpKernel\EventListener\ErrorsLoggerListener`, use `Symfony\Component\HttpKernel\EventListener\DebugHandlersListener` instead
+ * deprecated unused method `Symfony\Component\HttpKernel\Kernel::isClassInActiveBundle` and `Symfony\Component\HttpKernel\KernelInterface::isClassInActiveBundle`
+
+2.5.0
+-----
+
+ * deprecated `Symfony\Component\HttpKernel\DependencyInjection\RegisterListenersPass`, use `Symfony\Component\EventDispatcher\DependencyInjection\RegisterListenersPass` instead
+
+2.4.0
+-----
+
+ * added event listeners for the session
+ * added the KernelEvents::FINISH_REQUEST event
+
+2.3.0
+-----
+
+ * [BC BREAK] renamed `Symfony\Component\HttpKernel\EventListener\DeprecationLoggerListener` to `Symfony\Component\HttpKernel\EventListener\ErrorsLoggerListener` and changed its constructor
+ * deprecated `Symfony\Component\HttpKernel\Debug\ErrorHandler`, `Symfony\Component\HttpKernel\Debug\ExceptionHandler`,
+   `Symfony\Component\HttpKernel\Exception\FatalErrorException` and `Symfony\Component\HttpKernel\Exception\FlattenException`
+ * deprecated `Symfony\Component\HttpKernel\Kernel::init()``
+ * added the possibility to specify an id an extra attributes to hinclude tags
+ * added the collect of data if a controller is a Closure in the Request collector
+ * pass exceptions from the ExceptionListener to the logger using the logging context to allow for more
+   detailed messages
+
+2.2.0
+-----
+
+ * [BC BREAK] the path info for sub-request is now always _fragment (or whatever you configured instead of the default)
+ * added Symfony\Component\HttpKernel\EventListener\FragmentListener
+ * added Symfony\Component\HttpKernel\UriSigner
+ * added Symfony\Component\HttpKernel\FragmentRenderer and rendering strategies (in Symfony\Component\HttpKernel\Fragment\FragmentRendererInterface)
+ * added Symfony\Component\HttpKernel\DependencyInjection\ContainerAwareHttpKernel
+ * added ControllerReference to create reference of Controllers (used in the FragmentRenderer class)
+ * [BC BREAK] renamed TimeDataCollector::getTotalTime() to
+   TimeDataCollector::getDuration()
+ * updated the MemoryDataCollector to include the memory used in the
+   kernel.terminate event listeners
+ * moved the Stopwatch classes to a new component
+ * added TraceableControllerResolver
+ * added TraceableEventDispatcher (removed ContainerAwareTraceableEventDispatcher)
+ * added support for WinCache opcode cache in ConfigDataCollector
+
+2.1.0
+-----
+
+ * [BC BREAK] the charset is now configured via the Kernel::getCharset() method
+ * [BC BREAK] the current locale for the user is not stored anymore in the session
+ * added the HTTP method to the profiler storage
+ * updated all listeners to implement EventSubscriberInterface
+ * added TimeDataCollector
+ * added ContainerAwareTraceableEventDispatcher
+ * moved TraceableEventDispatcherInterface to the EventDispatcher component
+ * added RouterListener, LocaleListener, and StreamedResponseListener
+ * added CacheClearerInterface (and ChainCacheClearer)
+ * added a kernel.terminate event (via TerminableInterface and PostResponseEvent)
+ * added a Stopwatch class
+ * added WarmableInterface
+ * improved extensibility between bundles
+ * added profiler storages for Memcache(d), File-based, MongoDB, Redis
+ * moved Filesystem class to its own component