fix: add exec flag for npx launcher

index.js

@@ -1,3 +1,5 @@
+#!/usr/bin/env node
+'use strict';
 const Cheerio = require('cheerio');
 const { promises: fs, createWriteStream } = require('fs');
 const debug = require('debug')('vk-music-dl');

package.json

@@ -14,6 +14,10 @@
     "type": "git",
     "url": "https://home.hugopoi.net/gitea/hugopoi/vk-music-dl"
   },
+  "files": [
+    "index.js",
+    "README.md"
+  ],
   "license": " GPL-3.0-or-later",
   "dependencies": {
     "bluebird": "^3.7.2",