Added docs for ConsoleLogger::hasErrored()

Author: javiereguiluz

components/console/logger.rst

@@ -103,4 +103,15 @@ constructor::
     );
     $logger = new ConsoleLogger($output, array(), $formatLevelMap);
 
+Errors
+------
+
+.. versionadded:: 3.2
+    The ``hasErrored()`` method was introduced in Symfony 3.2.
+
+The Console logger includes a ``hasErrored()`` method which returns ``true`` as
+soon as any error message has been logged during the execution of the command.
+This is useful to decide which status code to return as the result of executing
+the command.
+
 .. _PSR-3: http://www.php-fig.org/psr/psr-3/