Merge branch '3.4' into 4.1

* 3.4:
  Fix: Adjust DocBlock
  \"ParserTest->getParserTestData()\" -> only some more tests
  [Lock] Pedantic improvements for lock
  [EventDispatcher] Fixed phpdoc on interface
  update year in license files
  [Console] Fix help text for single command applications
  Fix random test failure on lock
  improve error message when using test client without the BrowserKit component
  [Event Dispatcher] fixed 29703: TraceableEventDispatcher reset now sets callStack to null with test to dispatch after reset.
  Fixed minor typos
  Fix: Method can also return null
  [Stopwatch] Fixed phpdoc for category name

LICENSE

@@ -1,4 +1,4 @@
-Copyright (c) 2014-2018 Fabien Potencier
+Copyright (c) 2014-2019 Fabien Potencier
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal