Merge pull request #170 from zhb127/fix/remove_transaction_allowed_check

fix: DoTransaction remove transactionAllowed

client.go

@@ -323,16 +323,16 @@ func (c *Client) DoTransaction(ctx context.Context, callback func(sessCtx contex
 
 // ServerVersion get the version of mongoDB server, like 4.4.0
 func (c *Client) ServerVersion() string {
-	var serverStatus bson.Raw
+	var buildInfo bson.Raw
 	err := c.client.Database("admin").RunCommand(
 		context.Background(),
-		bson.D{{"serverStatus", 1}},
-	).Decode(&serverStatus)
+		bson.D{{"buildInfo", 1}},
+	).Decode(&buildInfo)
 	if err != nil {
 		fmt.Println("run command err", err)
 		return ""
 	}
-	v, err := serverStatus.LookupErr("version")
+	v, err := buildInfo.LookupErr("version")
 	if err != nil {
 		fmt.Println("look up err", err)
 		return ""