Add missing entry to console upgrade log

Author: jschaedl

UPGRADE-5.3.md

@@ -10,6 +10,7 @@ Console
 -------
 
  * Deprecate `Helper::strlen()`, use `Helper::width()` instead.
+ * Deprecate `Helper::strlenWithoutDecoration()`, use `Helper::removeDecoration()` instead.
 
 DoctrineBridge
 --------------

UPGRADE-6.0.md

@@ -24,6 +24,7 @@ Console
 
  * `Command::setHidden()` has a default value (`true`) for `$hidden` parameter
  * Remove `Helper::strlen()`, use `Helper::width()` instead.
+ * Remove `Helper::strlenWithoutDecoration()`, use `Helper::removeDecoration()` instead.
 
 DependencyInjection
 -------------------