added release notes for build-pipeline enhancements by @gdziadkiewicz

Author: FreeAndNil

src/site/xdoc/release/release-notes.xml

@@ -28,13 +28,23 @@ limitations under the License.
         <section id="a3.0.4-bug" name="Bug fixes">
           <ul>
             <li>
-              <a href="https://github.com/apache/logging-log4net/issues/216">Breaking change to FileAppender in 3.0.2</a> (reported by @sketchturner, fixed by @FreeAndNil in <a href="https://github.com/apache/logging-log4net/pull/217">#217</a>)
+              <a href="https://github.com/apache/logging-log4net/issues/216">Breaking change to FileAppender in 3.0.2</a> (reported by @sketchturner, fixed by @sketchturner in <a href="https://github.com/apache/logging-log4net/pull/217">#217</a>)
             </li>
             <li>
               <a href="https://github.com/apache/logging-log4net/issues/225">XmlLayoutSchemaLog4J: Changed XML start element for exceptions since v3.0.0</a> (reported by @sita-martin, fixed by @FreeAndNil in <a href="https://github.com/apache/logging-log4net/pull/226">#226</a>)
             </li>
           </ul>
         </section>
+        <section id="a3.0.4-enhancements" name="Enhancements">
+          <ul>
+            <li>
+              <a href="https://github.com/apache/logging-log4net/pull/204">Turn on the CI build for PRs</a> (by @gdziadkiewicz)
+            </li>
+            <li>
+              <a href="https://github.com/apache/logging-log4net/pull/215">Keep old, working ubuntu image version</a> (by @gdziadkiewicz)
+            </li>
+          </ul>
+        </section>
       </section>
       <section id="a3.0.3" name="3.0.3">
         Apache log4net 3.0.3 addresses reported issues: