change log update

Signed-off-by: Yijie Qin <[email protected]>

Author: qinxx108

CHANGELOG.md

@@ -26,6 +26,7 @@
 * [BUGFIX] Fixed ingesters with less tokens stuck in LEAVING. #5061
 * [BUGFIX] Tracing: Fix missing object storage span instrumentation. #5074
 * [BUGFIX] Ingester: Ingesters returning empty response for metadata APIs. #5081
+* [FEATURE] Alertmanager: Add support for time_intervals. #5102 
 
 ## 1.14.0 2022-12-02