Added the version number where the setDefaultCommand was introduced

Author: dcsg

components/console/changing_default_behavior.rst

@@ -4,6 +4,10 @@
 Changing the Default Behavior
 =============================
 
+.. versionadded:: 2.5,
+    The :method:`Symfony\\Component\\Console\\Application::setDefaultCommand`
+    method was introduced in version 2.5
+
 When building a command line tool, you may need to customize it to fit your needs.
 Probably you want to change the Default Command that the Application runs or
 maybe you just want to run a Single Command instead of have to pass the command