Triple the timeout values we're using

There are occasional reports of download failure from users, so
lets triple these values to see if that improves things.

main.go

@@ -109,8 +109,8 @@ func main() {
 	s := &http.Server{
 		ErrorLog:     HttpErrorLog(),
 		Handler:      router,
-		ReadTimeout:  10 * time.Second,
-		WriteTimeout: 10 * time.Second,
+		ReadTimeout:  30 * time.Second,
+		WriteTimeout: 30 * time.Second,
 	}
 
 	// If TLS Cert and key file paths are given, then we're using TLS