Added release date

Author: mmallis87

CHANGELOG.md

@@ -1,7 +1,7 @@
 # DocuSign Java Client Changelog
 See [DocuSign Support Center](https://support.docusign.com/en/releasenotes/) for Product Release Notes.
 
-## [v3.0.0-RC1] - eSignature API v2.1-19.1.02
+## [v3.0.0-RC1] - eSignature API v2.1-19.1.02 - 2019-06-07
 ### Changed
 - The SDK now supports version v2.1-19.1.02 of the DocuSign eSignature API.
 - SDK Release Version updated.