CHANGELOG.md in groupdate-5.2.0 vs CHANGELOG.md in groupdate-5.2.1

@@ -1,4 +1,9 @@
+## 5.2.1 (2020-09-09)
+
+- Improved error message for invalid ranges
+- Fixed bug with date string ranges
+
 ## 5.2.0 (2020-09-07)
 
 - Added warning for non-attribute argument
 - Added support for beginless and endless ranges in `range` option