How to change the app path to api in Laravel 5 directory structure

In Laravel 5 I'd like to change the default directory structure, so the path for app I want to move it to something like api, how can I accomplish this?

Example, instead of this structure:

.
├── app
├── bootstrap
├── config
├── database
├── public
├── resources
├── storage
├── tests
└── vendor

I want this:

.
├── api
├── bootstrap
├── config
├── database
├── public
├── resources
├── storage
├── tests
└── vendor

In my composer I've changed the namespace like so, as following this question: How to change app folder name in laravel 5:

"autoload": {
    "classmap": [
        "database"
    ],
    "psr-4": {
        "Api\\": "api/"
    }
},

But I'm getting the error:

[RuntimeException]                       
  Unable to detect application namespace.

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