Add 1.3.15 release notes (#604)

* Add 1.3.15 release notes

Signed-off-by: Chase Engelbrecht <[email protected]>

* Add release notes PR

Signed-off-by: Chase Engelbrecht <[email protected]>

---------

Signed-off-by: Chase Engelbrecht <[email protected]>

Author: engechas

release-notes/opensearch-common-utils.release-notes-1.3.15.0.md

@@ -0,0 +1,9 @@
+## Version 1.3.15.0
+Compatible with OpenSearch 1.3.15
+
+### Maintenance
+* Increment version to 1.3.15. ([#575](https://github.com/opensearch-project/common-utils/pull/575))
+* Forced ktlint to use logback-core:1.2.13, and logback-classic:1.2.13 to address CVE ([#602](https://github.com/opensearch-project/common-utils/pull/602))
+
+### Documentation
+* Added 1.3.15 release notes. ([#604](https://github.com/opensearch-project/common-utils/pull/604))