more often and fix bash

main.go

@@ -18,7 +18,7 @@ func main() {
 	if err != nil {
 		panic(err)
 	}
-	interval := time.Hour * 4
+	interval := time.Minute * 30
 	for true {
 		err := do(client)
 		if err != nil {

youtubedl/client.go

@@ -49,7 +49,7 @@ func (c *Client) Download(video, local string) error {
 		return err
 	}
 	cmd := exec.Command(
-		"bash",
+		"/bin/bash",
 		"-c",
 		fmt.Sprintf(
 			"true; python3 -m vtt_to_srt %q || python3 /usr/bin/vtt_to_srt.py %q",