Add CRITICAL as a valid value for cse_custom_insight severity field

Author: Pedro Montiel

CHANGELOG.md

@@ -4,7 +4,7 @@ FEATURES:
 * Add new optional `alert_name` field to resource/sumologic_monitor.
 
 BUG FIXES:
-* Add CRITICAL as a valid value for cse_custom_insight severity field
+* Add CRITICAL as a valid value for cse_custom_insight severity field (GH-367)
 
 ## 2.14.0 (March 30, 2022)