Update and rename 3.3.9.md to 3.4.0.md

Author: yaira2

3.3.9.md renamed to 3.4.0.md

@@ -1,4 +1,4 @@
-**Changes in v3.3.9**
+**Changes in v3.4**
 
 - Added support for personalizing Files with a custom background image
 - Added support for remapping keyboard shortcuts
@@ -10,6 +10,7 @@
 - Added audio bitrate, and video to the list of properties in the Details Pane
 - The Recent Files widget now respects the setting for displaying file extensions
 - Improved the display of keyboard shortcuts in the Command Palette
+- Fixed an issue where pinned items weren't displayed in the sidebar
 - Fixed an issue clicking the header in the details view wouldn't change the sort direction
 - Fixed an issue where the adaptive layout option wasn't disabled when syncing layout settings
 - Fixed an issue where changing the sort preferences didn't work properly when syncing layout settings