{
  "name": "edwin/microframework",
  "type": "project",
  "version": "1.0",
  "description": "Pequeño framework para proyectos php",
  "homepage": "https://github.com/tavo1987/microframework",
  "license": "MIT",
  "authors": [
      {
        "name": "Edwin Ramírez",
        "email": "tavo198718@gmail.com",
        "homepage": "https://www.facebook.com/edwin.ramirez.923",
        "role": "Developer"
      }
  ],

  "require": {
    "php": ">=5.2.0",
    "illuminate/database": "^5.2",
    "vlucas/phpdotenv": "^2.2",
    "sendgrid/sendgrid": "^4.0",
    "filp/whoops": "^2.1",
    "twig/twig": "~1.0"
  },


  "autoload": {
    "psr-4": {
      "App\\": "app/"
    },

    "files": [
      "bootstrap/helpers.php"
    ]
  }

}

{
    "name": "edwin/microframework",
    "type": "project",
    "version": "1.0",
    "description": "Pequeño framework para proyectos php",
    "homepage": "https://github.com/tavo1987/microframework",
    "license": "MIT",
    "authors": [
        {
            "name": "Edwin Ramírez",
            "email": "tavo198718@gmail.com",
            "homepage": "https://www.facebook.com/edwin.ramirez.923",
            "role": "Developer"
        }
    ],

    "require": {
        "php": ">=5.2.0",
        "illuminate/database": "^5.2",
        "vlucas/phpdotenv": "^2.2",
        "sendgrid/sendgrid": "^4.0",
        "filp/whoops": "^2.1",
        "twig/twig": "~1.0"
    },


    "autoload": {
        "psr-4": {
            "App\\": "app/",
            "Core\\": "core/"
        },

        "files": [
            "bootstrap/helpers.php"
        ]
    }
}

Add psr-4 for directory core
Add psr-4 for directory  core
