Corrects NOTICE file copyright date range

* Follow-up on opensearch-project#3051

Resolves opensearch-project#765

Signed-off-by: Tommy Markley <5437176+tmarkley@users.noreply.github.com>

CHANGELOG.md

@@ -116,6 +116,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - [Doc] Add readme for global query persistence ([#3001](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/3001))
 - Updates NOTICE file, adds validation to GitHub CI ([#3051](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/3051))
 - [Doc] Add current plugin persistence implementation readme ([#3081](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/3081))
+- Corrects NOTICE file copyright date range ([#3308](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/3308))
 
 ### 🛠 Maintenance
 

NOTICE.txt

@@ -3,7 +3,7 @@ Copyright OpenSearch Contributors
 
 This product includes software, including Kibana source code,
 developed by Elasticsearch (http://www.elastic.co).
-Copyright 2009-2018 Elasticsearch B.V.
+Copyright 2009-2021 Elasticsearch B.V.
 
 This product includes software developed by The Apache Software
 Foundation (http://www.apache.org/)

src/dev/notice/generate_notice_from_source.ts

@@ -37,7 +37,7 @@ const NOTICE_TEXT = `Copyright OpenSearch Contributors
 
 This product includes software, including Kibana source code,
 developed by Elasticsearch (http://www.elastic.co).
-Copyright 2009-2018 Elasticsearch B.V.
+Copyright 2009-2021 Elasticsearch B.V.
 
 This product includes software developed by The Apache Software
 Foundation (http://www.apache.org/)