title: Laravel use package in own project
body: <p>I'm building a package in <code>Laravel 5.5</code>. Now I want to use that package
  locally in my own project. </p>
  
  <p>The composer.json from my package looks like this:</p>
  
  <pre><code>{
      "name": "larsjanssen6/underconstruction",
      "license": "MIT",
      "homepage": "https://github.com/larsjanssen6/underconstruction",
      "authors": [
          {
              "name": "Lars Janssen",
              "email": "larsjanssen64@gmail.com",
              "role": "Developer"
          }
      ],
      "require": {
          "php" : "^7.0",
          "illuminate/support": "~5.5.0"
      },
      "autoload": {
          "psr-4": {
              "LarsJanssen\\underconstruction\\": "src/"
          }
      },
      "minimum-stability": "dev",
      "prefer-stable": true,
      "extra": {
          "laravel": {
              "providers": [
                  "LarsJanssen\\underconstruction\\UnderConstructionServiceProvider"
              ]
          }
      }
  }
  </code></pre>
  
  <p>(<a href="https://github.com/larsjanssen6/underconstruction" rel="nofollow noreferrer">https://github.com/larsjanssen6/underconstruction</a>)</p>
  
  <p>In a fresh laravel project I've added the package like this in my composer.json file:</p>
  
  <pre><code>{
      "name": "laravel/laravel",
      "description": "The Laravel Framework.",
      "keywords": ["framework", "laravel"],
      "license": "MIT",
      "type": "project",
      "repositories": [
          {
              "type": "vcs",
              "url": "https://github.com/larsjanssen6/underconstruction"
          }
      ],
      "require": {
          "php": "&gt;=7.0.0",
          "fideloper/proxy": "~3.3",
          "laravel/framework": "5.5.*",
          "laravel/tinker": "~1.0",
          "larsjanssen6/underconstruction": "master"
      },
      "require-dev": {
          "filp/whoops": "~2.0",
          "fzaninotto/faker": "~1.4",
          "mockery/mockery": "0.9.*",
          "phpunit/phpunit": "~6.0"
      },
      "autoload": {
          "classmap": [
              "database/seeds",
              "database/factories"
          ],
          "psr-4": {
              "App\\": "app/"
          }
      },
      "autoload-dev": {
          "psr-4": {
              "Tests\\": "tests/"
          }
      },
      "extra": {
          "laravel": {
              "dont-discover": [
              ]
          }
      },
      "scripts": {
          "post-root-package-install": [
              "@php -r \"file_exists('.env') || copy('.env.example', '.env');\""
          ],
          "post-create-project-cmd": [
              "@php artisan key:generate"
          ],
          "post-autoload-dump": [
              "Illuminate\\Foundation\\ComposerScripts::postAutoloadDump",
              "@php artisan package:discover"
          ]
      },
      "config": {
          "preferred-install": "dist",
          "sort-packages": true,
          "optimize-autoloader": true
      }
  }
  </code></pre>
  
  <p>But I receive this error:</p>
  
  <pre><code>Your requirements could not be resolved to an installable set of packages.
  
    Problem 1
      - The requested package larsjanssen6/underconstruction could not be found in any version, there may be a typo in the package name.
  </code></pre>
  
  <p>What could be wrong here?</p>