update changelog

Author: sumovishal

CHANGELOG.md

@@ -1,14 +1,15 @@
 ## 2.12.0 (Unreleased)
 
-BUG FIXES:
-
-* sumologic_cse_log_mapping split_index as int (GH-333)
-* Gcp Metrics Source (GH-329, 332)
+FEATURES:
+* **New Resource:** Gcp Metrics Source `sumologic_gcp_metrics_source` (GH-329, 332)
 
 ENHANCEMENTS:
-
 * Add backoff on http 429s (GH-338)
 
+BUG FIXES:
+* Fix to allow more than one topology_label for Dashboard resource (GH-336)
+* sumologic_cse_log_mapping split_index as int (GH-333)
+
 ## 2.11.5 (December 14, 2021)
 
 BUG FIXES: