fix: wrong type of field in struct Dash

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修改video.go/Dash 结构体的以下字段

Minbuffertime int            `json:"minBufferTime"`   // 1.5？
MinBufferTime int            `json:"min_buffer_time"` // 1.5？

不再出现断言在 util.go:72

if err = json.Unmarshal(resp.Body(), &cr); err != nil {
		return out, errors.WithStack(err)
	}

时导致的
json: cannot unmarshal number 1.5 into Go struct field Dash.data.dash.minBufferTime of type int

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补充一下原先问题的复现代码

// client已经设置了cookies
res, err := client.GetVideoPageList(bilibili.VideoParam{
		Bvid: "1FEzoYvEDh",
	})

	if err != nil {
		fmt.Println(err)
		return
	}

	var final_cid int
	fmt.Println("==cid list==")
	for idx, val := range res {
		fmt.Printf("idx: %d\n", idx)
		fmt.Println(val.Cid)
		final_cid = val.Cid
	}

	_res, err := client.GetVideoStream(bilibili.GetVideoStreamParam{
		Bvid:  "1FEzoYvEDh",
		Fnval: 16,
		Cid:   final_cid,
	})

	if err != nil {
		fmt.Println(err)
		return
	}


	for idx, val := range _res.Dash.Audio {
		fmt.Printf("idx: %d\n", idx)
		fmt.Println(val.Baseurl)
		fmt.Println("backup")
		fmt.Println(val.Backupurl)
	}

Output:

==cid list==
idx: 0
27122141682
json: cannot unmarshal number 1.5 into Go struct field Dash.data.dash.minBufferTime of type int

修复后

Output

=cid list==
idx: 0
27122141682
idx: 0
https://xy112x29x112x205xy.mcdn.bilivideo.cn:8082/v1/resource/27122141682-1-30280.m4s?agrr=1&b...
backup
[https://xy118x184x254x112xy240ey5ay7820y1y1yy112xy.mcdn.bilivideo.cn:4483/upgcxcode/82/16/27122141682/27122141682-1-30280.m4s?e=ig8e...