Update NEWS for 2.5.0~rc4

I forgot this in the previous patch.
Signed-off-by: Michael Hanselmann <hansmi@google.com>
Reviewed-by: Andrea Spadaccini <spadaccio@google.com>

NEWS

 News
 ====
 
-Version 2.5.0 rc3
+Version 2.5.0 rc4
 -----------------
 
-*(Released Wed, 26 Oct 2011)*
+*(Released Thu, 27 Oct 2011)*
 
 Incompatible/important changes and bugfixes
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -129,6 +129,14 @@ Misc
 - DRBD metadata volumes are overwritten with zeros during disk creation.
 
 
+Version 2.5.0 rc3
+-----------------
+
+*(Released Wed, 26 Oct 2011)*
+
+This was the third release candidate of the 2.5 series.
+
+
 Version 2.5.0 rc2
 -----------------