[feature] redirect logs into /dev/null, avoid creating temp file.

[feature] optimize readme

Signed-off-by: shadowhao <shadowhao.tencent.com>

README.md

@@ -2,7 +2,7 @@
 Alfred 4 workflow for mac bluetooth.
 
 ## Installation
-1. Download latest version from [releases](https://github.com/haoguanguan/bluetooth_flow/releases)
+1. Download latest version from [release](https://github.com/haoguanguan/bluetooth_flow/releases)
 2. Double click and install it
 ## Manual
 1. show all device info: just input `bb`
@@ -12,16 +12,17 @@ Alfred 4 workflow for mac bluetooth.
 
 ## Features
 1. show bluetooth device info
+
 	status/battery/name
 2. switch bluetooth status
-	connect -> disconnect
-	disconnect -> connect
+	1. connect -> disconnect
+	2. disconnect -> connect
 
 ## Build
 ```shell script
 go build entry.go
 ```
-You should download golang, and use go mod for dependency manager.
+You should download golang, and use go mod for dependency management.
 ## Acknowledgement
 1. I Got much information from [alfred-bluetooth-workflow](https://github.com/tilmanginzel/alfred-bluetooth-workflow)
 2. I also used [blueutil](https://github.com/toy/blueutil) for quickly switch device status

system/system.go

@@ -3,7 +3,6 @@ package system
 import (
 	"encoding/json"
 	"fmt"
-	"os"
 	"os/exec"
 )
 
@@ -13,18 +12,12 @@ type Info struct {
 }
 
 func NewSystem(key string) (*Info, error) {
-	command := fmt.Sprintf("system_profiler %s -json > .system.log", key)
+	command := fmt.Sprintf("system_profiler %s -json 2> /dev/null", key)
 	d, err := exec.Command("bash", "-c", command).CombinedOutput()
 	if err != nil {
 		return nil, err
 	}
 
-	// fmt.Printf("%s", string(d))
-	d, err = os.ReadFile(".system.log")
-	if err != nil {
-		return nil, err
-	}
-
 	var res map[string]interface{}
 	if err = json.Unmarshal(d, &res); err != nil {
 		return nil, err