add package update notifier

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "say-it",
-  "version": "0.1.2",
+  "version": "0.1.5",
   "lockfileVersion": 1,
   "dependencies": {
     "ajv": {

package.json

@@ -1,6 +1,6 @@
 {
   "name": "say-it",
-  "version": "0.1.4",
+  "version": "0.1.5",
   "description": "Read the text you typed in command line by using Baidu tts.",
   "main": "say-it.js",
   "bin": {
@@ -30,6 +30,7 @@
     "inquirer": "^3.0.6",
     "lodash": "^4.17.4",
     "play-sound": "^1.1.1",
-    "request": "^2.81.0"
+    "request": "^2.81.0",
+    "update-notifier": "^2.2.0"
   }
 }

say-it.js

@@ -10,6 +10,8 @@ const player = require('play-sound')(opts = {
 const charm = require('charm')()
 const TEXTS = require('./texts')
 const _ = require('lodash')
+const updateNotifier = require('update-notifier');
+const pkg = require('./package.json');
 
 const showError = (error = TEXTS.error) => {
   console.log(chalk.red(error))
@@ -19,6 +21,8 @@ var person = 0
 
 charm.pipe(process.stdout);
 
+updateNotifier({pkg}).notify(); //show npm package update if available
+
 program
   .version('0.1')
   .command(' ', 'read the texts you typed in', {