Use correct path in examples when using handlers nested in subdirs

Author: Frank Schmid

examples/serverless-offline/webpack.config.js

@@ -16,6 +16,6 @@ module.exports = {
   output: {
     libraryTarget: 'commonjs',
     path: path.join(__dirname, '.webpack'),
-    filename: 'handler.js'
+    filename: 'src/handler.js'
   },
 };