Add changelog for previous commit

ChangeLog

@@ -73,6 +73,7 @@ Small features:
   * New starpu_memory_get_total function to get the size of a memory node.
   * New starpu_parallel_task_barrier_init_n function to let a scheduler decide
     a set of workers without going through combined workers.
+  * Allow application to provide the task footprint itself.
 
 Changes:
   * Data interfaces (variable, vector, matrix and block) now define