Version 0.3
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* Post DiFX-2.6
* ignore non-SAS hotplug add events, such as USB hotplug device
* Version for DiFX-2.8

Version 0.2
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* Post DiFX-2.5
* Version for DiFX-2.6, Mar 4, 2019

Version 0.1
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* Initial version
* Version for DiFX-2.5, May 16, 2017