added ref to CMP direct POP update

Author: dghgit

docs/releasenotes.html

@@ -28,6 +28,7 @@ <h3>2.1.3 Additional Features and Functionality</h3>
 <ul>
 <li>A generic "COMPOSITE" algorithm name has been added as a JCA Signature algorithm. The algorithm will identify the composite signature to use from the composite key passed in.</li>
 <li>Support for the generation and use as trust anchors has been added for certificate signatures with id-alg-unsigned as the signature type.</li>
+<li>Support for CMP direct POP for encryption keys using challenge/response has been added to the CMP/CRMF APIs.</li>
 </ul>
 
 <a id="r1rv82"><h3>2.2.1 Version</h3></a>