fix typo

Author: haschek

CHANGELOG.md

@@ -12,7 +12,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/) and this p
 -   `<ActivityControlWidget />`
     -   `additionalActions` property to include other more complex components between the action buttons and the context menu of the widget
 -   `<Tooltip />`
-    -   `swapPlaceholderDelay` property to allow configuration of the delay time before the laceholder element is replaced by the actual tooltip component
+    -   `swapPlaceholderDelay` property to allow configuration of the delay time before the placeholder element is replaced by the actual tooltip component
 
 ### Changed