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

vendor/symfony/console/CHANGELOG.md

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+CHANGELOG
+=========
+
+2.6.0
+-----
+
+ * added a Process helper
+ * added a DebugFormatter helper
+
+2.5.0
+-----
+
+ * deprecated the dialog helper (use the question helper instead)
+ * deprecated TableHelper in favor of Table
+ * deprecated ProgressHelper in favor of ProgressBar
+ * added ConsoleLogger
+ * added a question helper
+ * added a way to set the process name of a command
+ * added a way to set a default command instead of `ListCommand`
+
+2.4.0
+-----
+
+ * added a way to force terminal dimensions
+ * added a convenient method to detect verbosity level
+ * [BC BREAK] made descriptors use output instead of returning a string
+
+2.3.0
+-----
+
+ * added multiselect support to the select dialog helper
+ * added Table Helper for tabular data rendering
+ * added support for events in `Application`
+ * added a way to normalize EOLs in `ApplicationTester::getDisplay()` and `CommandTester::getDisplay()`
+ * added a way to set the progress bar progress via the `setCurrent` method
+ * added support for multiple InputOption shortcuts, written as `'-a|-b|-c'`
+ * added two additional verbosity levels, VERBOSITY_VERY_VERBOSE and VERBOSITY_DEBUG
+
+2.2.0
+-----
+
+ * added support for colorization on Windows via ConEmu
+ * add a method to Dialog Helper to ask for a question and hide the response
+ * added support for interactive selections in console (DialogHelper::select())
+ * added support for autocompletion as you type in Dialog Helper
+
+2.1.0
+-----
+
+ * added ConsoleOutputInterface
+ * added the possibility to disable a command (Command::isEnabled())
+ * added suggestions when a command does not exist
+ * added a --raw option to the list command
+ * added support for STDERR in the console output class (errors are now sent
+   to STDERR)
+ * made the defaults (helper set, commands, input definition) in Application
+   more easily customizable
+ * added support for the shell even if readline is not available
+ * added support for process isolation in Symfony shell via
+   `--process-isolation` switch
+ * added support for `--`, which disables options parsing after that point
+   (tokens will be parsed as arguments)