Merge pull request #594 from SumoLogic/dagould-changelog-2.28.0

finalize changelog for v2.28.0

Author: dagould

CHANGELOG.md

@@ -1,8 +1,9 @@
-## 2.28.0 (Unreleased)
+## 2.28.1 (Unreleased)
+
+## 2.28.0 (November 23, 2023)
 FEATURES:
 * resource/sumologic_monitor: Added support for setting `time_zone` at Monitor level for notifications content (GH-586)
 
-## 2.27.1 (November 14, 2023)
 BUG FIXES: 
 * Fixes `resource_sumologic_cse_match_list` constant change when defining a match list containing a custom column using the custom columns name instead of ID (GH-591)