bpo-30040: update news entry (GH-12324)

This optimization is not only for space, but also for speed.
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Inada Naoki 2019-03-14 18:54:09 +09:00 committed by GitHub
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New empty dict uses fewer memory for now. It used more memory than empty New empty dict uses fewer memory for now. It used more memory than empty
dict created by ``dict.clear()``. Patch by Inada Naoki. dict created by ``dict.clear()``. And empty dict creation and deletion
is about 2x faster. Patch by Inada Naoki.