Change filename in README example

Author: Frank Schmid

README.md

@@ -139,15 +139,15 @@ module.exports = {
   output: {
     libraryTarget: 'commonjs',
     path: path.resolve(__dirname, '.webpack'),
-    filename: 'handler.js', // this should match the first part of function handler in `serverless.yml`
+    filename: '[name].js',
   },
   // ...
 };
 ```
 
 ### Stats
 
-By default, the plugin will print a quite verbose bundle information to your console. However, if 
+By default, the plugin will print a quite verbose bundle information to your console. However, if
 you are not satisfy with the current output info, you can overwrite it in your `webpack.config.js`
 
 ```js