Version 5.4.0 release (#115)

* Version 5.4.0-v2.1-20.2.02.02 release

* Updated changelog

Co-authored-by: DevCenter-DocuSign <dcdev@docusign.com>
Co-authored-by: Dhaval Brahmbhatt <dhaval.brahmbhatt@dsa017178.docusignhq.com>

CHANGELOG.md

@@ -3,6 +3,12 @@ All notable changes to this project will be documented in this file.
 
 See [DocuSign Support Center](https://support.docusign.com/en/releasenotes/) for Product Release Notes.
 
+## [5.4.0] - eSignature API v2.1-20.2.02 - 2020-08-25
+### Changed
+
+*   Added support for version v2.1-20.2.02 of the DocuSign eSignature API.
+*   Updated the SDK release version.
+
 ## [5.3.0] - eSignature API v2.1-20.2.00 - 2020-07-09
 ### Changed