update CHANGELOG.md

Signed-off-by: Kyeongwon Seo <[email protected]>

Author: kwSeo

CHANGELOG.md

@@ -44,7 +44,7 @@
 * [ENHANCEMENT] Add de-duplicated chunks counter `cortex_chunk_store_deduped_chunks_total` which counts every chunk not sent to the store because it was already sent by another replica. #2485
 * [ENHANCEMENT] query-frontend now also logs the POST data of long queries. #2481
 * [ENHANCEMENT] Experimental WAL: Ingester WAL records now have type header and the custom WAL records have been replaced by Prometheus TSDB's WAL records. Old records will not be supported from 1.3 onwards. Note: once this is deployed, you cannot downgrade without data loss. #2436
-* [ENHANCEMENT] Redis Cache: Added `idle_timeout`, `wait` and `max_conn_lifetime` options to redis cache configuration. 
+* [ENHANCEMENT] Redis Cache: Added `idle_timeout`, `wait` and `max_conn_lifetime` options to redis cache configuration. #2550 
 * [BUGFIX] Ruler: Ensure temporary rule files with special characters are properly mapped and cleaned up. #2506
 * [BUGFIX] Fixes #2411, Ensure requests are properly routed to the prometheus api embedded in the query if `-server.path-prefix` is set. #2372
 * [BUGFIX] Experimental TSDB: fixed chunk data corruption when querying back series using the experimental blocks storage. #2400