update change log
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| # 2.4.7-alpha (2019-10-24) | ||||
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| ### perfect | ||||
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| - **charts:** Optimize memory leaks. | ||||
| - **digitalFlop:** Optimize memory leaks. | ||||
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| # 2.4.6-alpha (2019-10-24) | ||||
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| ### Bug Fixes | ||||
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