add tips

app/task.go

@@ -1,6 +1,7 @@
 package app
 
 import (
+	"fmt"
 	"io/ioutil"
 	"log"
 	"math/rand"
@@ -68,6 +69,7 @@ func CrawlGo() {
 }
 
 func FetchNewConfigFileThenInit() {
+	fmt.Println("fetch new config file...")
 	resp, err := tool.GetHttpClient().Get("https://raw.githubusercontent.com/zu1k/proxypool/master/source.yaml")
 	if err != nil {
 		return