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mention the beta meaning change

Samuel Thibault %!s(int64=13) %!d(string=hai) anos
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      ChangeLog

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ChangeLog

@@ -61,6 +61,10 @@ Changes:
         To port code to use new names (this is not mandatory), the
         tools/dev/rename.sh script can be used, and pkg-config starpu-1.0 should
         be used.
+  * The communication cost in the heft and dmda scheduling strategies now
+        take into account the contention brought by the number of GPUs. This
+        changes the meaning of the beta factor, whose default 1.0 value should
+        now be good enough in most case.
 
 Small features:
   * Allow users to disable asynchronous data transfers between CPUs and