fix dev renderer

.erb/configs/webpack.config.renderer.dev.babel.js

@@ -260,5 +260,15 @@ export default merge(baseConfig, {
       verbose: true,
       disableDotRule: false,
     },
+    before() {
+      console.log('Starting Main Process...');
+      spawn('npm', ['run', 'start:main'], {
+        shell: true,
+        env: process.env,
+        stdio: 'inherit',
+      })
+        .on('close', (code) => process.exit(code))
+        .on('error', (spawnError) => console.error(spawnError));
+    },
   },
 });