report mojo: add user property for parameter dataFile (#322)

diff --git a/org.jacoco.doc/docroot/doc/changes.html b/org.jacoco.doc/docroot/doc/changes.html
index c36b564..61bbf98 100644
--- a/org.jacoco.doc/docroot/doc/changes.html
+++ b/org.jacoco.doc/docroot/doc/changes.html
@@ -20,6 +20,13 @@
 
 <h2>Snapshot Build @qualified.bundle.version@ (@build.date@)</h2>
 
+<h3>New Features</h3>
+<ul>
+  <li>User property <code>jacoco.dataFile</code> for parameter <code>dataFile</code>
+      of Maven <code>report</code> goal
+      (GitHub <a href="https://github.com/jacoco/jacoco/issues/322">#322</a>).</li>
+</ul>
+
 <h2>Release 0.7.7 (2016/06/06)</h2>
 
 <h3>New Features</h3>