add missing fix to changelog

Author: vkovec

CHANGELOG.md

@@ -1,10 +1,11 @@
 # Changes in Fbx Exporter
 
-## [3.0.2-preview.1] - 2020-03-19
+## [3.0.2-preview.1] - 2020-03-25
 ### Fixed
 - Blendshapes naming in FBX so that multiple blendshapes all import correctly in Maya.
 - Don't override transforms when creating FBX Linked Prefab, so that the prefab updates properly when the FBX transforms are modified.
 - Changed FBX Linked Prefab to keep Unity materials instead of using materials exported to FBX file.
+- Fix issue where Maya imports root bone as null object if it doesn't have any descendants that are also bones.
 
 ## [3.0.1-preview.2] - 2020-01-22
 ### Added