en/issues.dbk: revelation is obsolete

Closes: #883722

en/issues.dbk

@@ -65,6 +65,17 @@ information mentioned in <xref linkend="morereading"/>.
             replacement.
           </para>
         </listitem>
+        <listitem>
+          <para>
+            The package <systemitem role="package">revelation</systemitem>,
+            which is used to store passwords, is not included in &releasename;.
+            <systemitem role="package">keepass2</systemitem> can import
+            previously exported password XML files from <systemitem
+            role="package">revelation</systemitem>. Please make sure you export
+            your data from revelation before upgrading, to avoid loosing access
+            to your passwords.
+          </para>
+        </listitem>
       </itemizedlist>
     </para>
   </section>