Update CHANGELOG.md

Author: sl-solution

CHANGELOG.md

@@ -1,9 +1,15 @@
+# Dev
+
+## Features
+
+* Now `IMD` throws errors when accesses a grouped data set which its parent is modified.
+
 # Version 0.7.15
 
 ## Fixes
 
 * Functions `searchsorted`, `searchsortedfirst`, and `searchsortedlast` now works with `DatasetColumn`
-* Fix a bug which in `byrow(nunique)`
+* Fix a bug in `byrow(nunique)`
 
 # Version 0.7.14