Add Maxthon detection #468
Description
https://www.maxthon.cn/
Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.81 Safari/537.36 Maxthon/5.3.8.2000
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https://www.maxthon.cn/
Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.81 Safari/537.36 Maxthon/5.3.8.2000