add subarg,use -u to input url

-const {app, BrowserWindow} = require('electron')
+const {app, BrowserWindow} = require('electron');
+
+var subarg = require('subarg');
+
+var argv = subarg(process.argv.slice(2));
+if (argv.v || argv.version) {
+  console.log('electron v' + process.versions.electron);
+  console.log('chrome v' + process.versions.chrome);
+  return app.quit();
+}
+
+if (argv.d) {
+  var args = "args: ";
+  for (var i in argv) {
+    args += i + " = " + argv[i] + "\n";
+  }
+  console.log(args);
+}
+
+if(!argv.u){
+  console.log("you must input the web url to record with : -u ");
+  return app.quit();
+}
 
 app.disableHardwareAcceleration()
 
@@ -9,10 +31,10 @@ app.once('ready', () => {
       offscreen: true
     }
   })
-  win.loadURL('http://github.com')
+  win.loadURL(argv.u)
 
   var now = Date.now()
-  
+
   win.webContents.on("paint", function(event, dirty, image){
   console.log(
     "painting", 

@@ -14,7 +14,8 @@
   "author": "hubin",
   "license": "MIT",
   "dependencies": {
-    "electron": "^1.6.11"
+    "electron": "^1.6.11",
+    "subarg": "^1.0.0"
   },
   "devDependencies": {
     "electron-packager": "^8.7.2"