added voice command

procEcho.go

 }
 
 func echoServe(ss *openIDSessionData, in InWechatMsg) {
+	stopEcho := false
 	if in.header.MsgType == "text" {
-		if in.body.(TextMsg).Content == "结束Echo" {
-			in.replyText("echo 正式结束")
-			echoSummary(ss)
-			echoClean(ss)
+		if in.body.(TextMsg).Content == "结束Echo" || in.body.(TextMsg).Content == "结束echo" {
+			stopEcho = true
 			return
 		}
 	}
-	ss.refreshExpire(600)
-	echoCommand(ss, in)
+	if in.header.MsgType == "voice" {
+		if in.body.(VoiceMsg).Recognition == "退出退出。" {
+			stopEcho = true
+		}
+	}
+
+	if stopEcho {
+		in.replyText("echo 正式结束")
+		echoSummary(ss)
+		echoClean(ss)
+	} else {
+		ss.refreshExpire(600)
+		echoCommand(ss, in)
+	}
 
 }