fix: default image cdn url

plugin.go

@@ -232,12 +232,12 @@ get picture url
 func (p *Plugin) getPicURL() string {
 	pics := make(map[string]string)
 	//  success picture url
-	pics["success"] = "https://ws4.sinaimg.cn/large/006tNc79gy1fz05g5a7utj30he0bfjry.jpg"
+	pics["success"] = "https://wx1.sinaimg.cn/large/006tNc79gy1fz05g5a7utj30he0bfjry.jpg"
 	if p.Extra.Pic.SuccessPicURL != "" {
 		pics["success"] = p.Extra.Pic.SuccessPicURL
 	}
 	//  failure picture url
-	pics["failure"] = "https://ws1.sinaimg.cn/large/006tNc79gy1fz0b4fghpnj30hd0bdmxn.jpg"
+	pics["failure"] = "https://wx1.sinaimg.cn/large/006tNc79gy1fz0b4fghpnj30hd0bdmxn.jpg"
 	if p.Extra.Pic.FailurePicURL != "" {
 		pics["failure"] = p.Extra.Pic.FailurePicURL
 	}