fix misplaced default line

Author: chrisbreiding

README.md

@@ -105,6 +105,8 @@ browserify({
 })
 ```
 
+**Default**: `undefined`
+
 ## Modifying default options
 
 The default options are provided as `browserify.defaultOptions` so they can be more easily modified.
@@ -122,8 +124,6 @@ module.exports = (register, config) => {
 }
 ```
 
-**Default**: `undefined`
-
 ## License
 
 This project is licensed under the terms of the [MIT license](/LICENSE.md).