Changelog: mention latest updates

(cherry picked from commit f8fc0f1a3eb007eebe257afebaf3b803d3544bc1)

ChangeLog

@@ -124,7 +124,14 @@ Small changes:
     scheduler context
   * Fonction starpu_is_initialized() is moved to the public API.
 
-StarPU 1.2.5 (git revision xxx)
+StarPU 1.2.6 (git revision xxx)
+==============================================
+
+Small changes:
+  * Fix crash for lws scheduler
+  * Avoid making hwloc load PCI topology when CUDA is not enabled
+
+StarPU 1.2.5 (git revision 22f32916916d158e3420033aa160854d1dd341bd)
 ==============================================
 
 Small features: