When run it with large threads, it panic this error.
ath/rand.(*rngSource).Uint64(...) /usr/local/Cellar/go/1.11.1/libexec/src/math/rand/rng.go:249 math/rand.(*rngSource).Int63(0xc000097500, 0x1) /usr/local/Cellar/go/1.11.1/libexec/src/math/rand/rng.go:234 +0x89 math/rand.(*Rand).Int63(0xc000082f90, 0x412c70) /usr/local/Cellar/go/1.11.1/libexec/src/math/rand/rand.go:85 +0x33 math/rand.(*Rand).Int31(0xc000082f90, 0x1) /usr/local/Cellar/go/1.11.1/libexec/src/math/rand/rand.go:99 +0x2b math/rand.(*Rand).Int31n(0xc000082f90, 0xbb8, 0xc00052e580) /usr/local/Cellar/go/1.11.1/libexec/src/math/rand/rand.go:134 +0x4f math/rand.(*Rand).Intn(0xc000082f90, 0xbb8, 0xfa) /usr/local/Cellar/go/1.11.1/libexec/src/math/rand/rand.go:172 +0x45

After google something, I see math/rand is not threads safe. I think we should add mutex for it.

GOROOT=C:\Go #gosetup
GOPATH=C:\Users\Administrator\go #gosetup
C:\Go\bin\go.exe build -o C:\Users\Administrator\AppData\Local\Temp___go_build_demo_02_demo1.exe demo_02/demo1 #gosetup
C:\Users\Administrator\AppData\Local\Temp___go_build_demo_02_demo1.exe #gosetup
2020/12/02 15:02:20 Random:
2020/12/02 15:02:20 Chrome:
2020/12/02 15:02:20 IE:
2020/12/02 15:02:20 Firefox:
2020/12/02 15:02:20 Safari:
2020/12/02 15:02:20 Android:
2020/12/02 15:02:20 MacOSX:
2020/12/02 15:02:20 IOS:
2020/12/02 15:02:20 Linux:
2020/12/02 15:02:20 IPhone:
2020/12/02 15:02:20 IPad:
2020/12/02 15:02:20 Computer:
2020/12/02 15:02:20 Mobile:

Process finished with exit code 0

Hi,
Any way to get specific version of android user-agent?

`package main

import (
browser "github.com/eddycjy/fake-useragent"
"log"
)

func main() {
random := browser.Random()
log.Printf("Random: %s", random)
chrome := browser.Chrome()
log.Printf("Chrome: %s", chrome)
}

out put
GOROOT=/usr/local/go #gosetup
GOPATH=/Users/xiaxichen/go #gosetup
/usr/local/go/bin/go build -o /private/var/folders/qk/tgc9vq6j6lbgwlsxgb4lyyd40000gn/T/___go_build_main_go /Users/xiaxichen/goDistributedSpider/crawl/main.go #gosetup
/private/var/folders/qk/tgc9vq6j6lbgwlsxgb4lyyd40000gn/T/___go_build_main_go

2020/10/10 15:19:19 Random: Mozilla/5.0 (Linux; Android 6.0; MotoG3 Build/MPIS24.65-33.1-2-16) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.91 Mobile Safari/537.36
2020/10/10 15:19:19 Chrome:

`

求更新一下，的确如楼下一样，返回值全是空！请求作者更新

A simple function, 10 sentences can be written, you see you have a lot of kakaka, too much is also a remote address download cache, Chinese mainland can not visit, what do you think, the idea is good, can update the version, but a few years you have not updated, so do not be so old fellow, old iron! Finally, thank you for sorting out the JSON data Province in this project

Hello.

In code func (s *Spider) StartBrowser(..) mistake.

was:
body, err := downloader.Get(url)
defer body.Close()
if err != nil {
return
}

need:
body, err := downloader.Get(url)
if err != nil {
return
}
defer body.Close()