Support for API v2.1 is GA now

Author: mmallis87

README.md

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-<p><h3>&#x26A0;&#xFE0F; The current release is <code>the first version to use <a href=“https://developers.docusign.com/esign-rest-api“>eSignature API v2.1</a></code>. The GA version will be released soon.</h3></p><p><h3>All previous releases use eSignature API v2 and they no longer will be actively maintained.</p>
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 ## Requirements
 
 - Java 1.7+