Fix config default value not deep merged

app.js

@@ -31,7 +31,7 @@ const options = commandLineArgs(optionDefinitions);
 
 global.syzoj = {
   rootDir: __dirname,
-  config: Object.assign({}, require('./config-example.json'), require(options.config)),
+  config: require('object-assign-deep')({}, require('./config-example.json'), require(options.config)),
   configDir: options.config,
   models: [],
   modules: [],

package.json

@@ -52,6 +52,7 @@
     "mysql2": "^1.6.2",
     "node-7z": "^0.4.0",
     "nodemailer": "^4.1.0",
+    "object-assign-deep": "^0.4.0",
     "pygmentize-bundled-cached": "^1.1.0",
     "randomstring": "^1.1.5",
     "request": "^2.74.0",