update avatar, remove gzip request header

modules/avatar/avatar.go

@@ -251,8 +251,8 @@ var client = &http.Client{}
 
 func (this *thunderTask) fetch() error {
 	req, _ := http.NewRequest("GET", this.Url, nil)
-	req.Header.Set("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8")
-	req.Header.Set("Accept-Encoding", "gzip,deflate,sdch")
+	req.Header.Set("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/jpeg,image/png,*/*;q=0.8")
+	req.Header.Set("Accept-Encoding", "deflate,sdch")
 	req.Header.Set("Accept-Language", "zh-CN,zh;q=0.8")
 	req.Header.Set("Cache-Control", "no-cache")
 	req.Header.Set("User-Agent", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/33.0.1750.154 Safari/537.36")