fix bilibili.com
fix bilibili.com

sample: python3 you-get -i http://www.bilibili.com/video/av663903/

Before fix it return:

Video Site: bilibili.com
Title:      【美版无间道】无间道风云【小李子-马呆萌】【犯罪】[2006]
Type:       Flash video (video/x-flv)
Size:       0.17 MiB (180635 Bytes)

This is a error.mp4 file

After fix it return:

Video Site: bilibili.com
Title:      【美版无间道】无间道风云【小李子-马呆萌】【犯罪】[2006]
Type:       Flash video (video/x-flv)
Size:       1989.14 MiB (2085762683 Bytes)

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