Update CHANGELOG.md

Author: diondokter

CHANGELOG.md

@@ -10,6 +10,8 @@
 - Added `space_left` function for queue
 - Added a new `map::remove_all_items()` API to remove all stored items in flash.
 
+This release is 'disk'-compatible with 2.0
+
 ## 2.0.2 07-05-24
 
 - Added check for too big items that won't ever fit in flash so it returns a good clear error.