fix CHANGELOG: move entry for -cassandra.table-options to correct section

from `## 1.1.0 / 2020-05-21` section to `## 1.2.0 / 2020-06-xx` section (#2787)

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

Author: kwSeo

CHANGELOG.md

@@ -58,6 +58,7 @@
 * [FEATURE] TLS config options added for GRPC clients in Querier (Query-frontend client & Ingester client), Ruler, Store Gateway, as well as HTTP client in Config store client. #2502
 * [FEATURE] The flag `-frontend.max-cache-freshness` is now supported within the limits overrides, to specify per-tenant max cache freshness values. The corresponding YAML config parameter has been changed from `results_cache.max_freshness` to `limits_config.max_cache_freshness`. The legacy YAML config parameter (`results_cache.max_freshness`) will continue to be supported till Cortex release `v1.4.0`. #2609
 * [FEATURE] Experimental gRPC Store: Added support to 3rd parties index and chunk stores using gRPC client/server plugin mechanism. #2220
+* [FEATURE] Add `-cassandra.table-options` flag to customize table options of Cassandra when creating the index or chunk table. #2575
 * [ENHANCEMENT] Propagate GOPROXY value when building `build-image`. This is to help the builders building the code in a Network where default Go proxy is not accessible (e.g. when behind some corporate VPN). #2741
 * [ENHANCEMENT] Querier: Added metric `cortex_querier_request_duration_seconds` for all requests to the querier. #2708
 * [ENHANCEMENT] Cortex is now built with Go 1.14. #2480 #2749 #2753
@@ -183,7 +184,6 @@ Please make sure to review renamed metrics, and update your dashboards and alert
 * [FEATURE] TLS config options added to the Server. #2535
 * [FEATURE] Experimental: Added support for `/api/v1/metadata` Prometheus-based endpoint. #2549
 * [FEATURE] Add ability to limit concurrent queries to Cassandra with `-cassandra.query-concurrency` flag. #2562
-* [FEATURE] Add `-cassandra.table-options` flag to customize table options of Cassandra when creating the index or chunk table. #2575
 * [FEATURE] Experimental TSDB: Introduced store-gateway service used by the experimental blocks storage to load and query blocks. The store-gateway optionally supports blocks sharding and replication via a dedicated hash ring, configurable via `-experimental.store-gateway.sharding-enabled` and `-experimental.store-gateway.sharding-ring.*` flags. The following metrics have been added: #2433 #2458 #2469 #2523
   * `cortex_querier_storegateway_instances_hit_per_query`
 * [ENHANCEMENT] Experimental TSDB: sample ingestion errors are now reported via existing `cortex_discarded_samples_total` metric. #2370