Make stars fly faster

I.e. update them in parallel.

go/stars/stars.go

	"os/exec"
	"path"
	"strings"
	"sync"
	"time"
)
var userName = "heyLu"
var directory = "github-stars"
var concurrency = 10
func main() {
	var stars []starInfo
		panic(err)
	}
	sem := make(chan bool, 10)
	var wg sync.WaitGroup
	wg.Add(len(stars))
	for _, info := range stars {
		fmt.Printf("% 48s - %s\n", info.RepoName, info.Description)
		err := updateRepo(info)
		if err != nil {
			fmt.Println(err)
			os.Exit(1)
		}
		info := info
		sem <- true
		go func() {
			fmt.Printf("% 48s - %s\n", info.RepoName, info.Description)
			err := updateRepo(info)
			if err != nil {
				fmt.Println(err)
				os.Exit(1)
			}
			wg.Done()
			<-sem
		}()
	}
	wg.Wait()
}
func updateRepo(info starInfo) error {