title: Composer Update - Could not load package shopware/shopware in http://packagist.org:
body: <p>When i do composer update on my Laravel 5.1 it come out with this error</p>
  
  <pre><code>&gt; Downloading http://packagist.org/p/symfony/polyfill-mbstring$a9a5f6e4a8af44008f50a8c0059a6d1a61b1f692627fb41f0cc1f3e8bbfb7205.json
  &gt; Writing /root/.composer/cache/repo/https---packagist.org/provider-symfony$polyfill-mbstring.json into cache
  
  
  
    [RuntimeException]
    Could not load package shopware/shopware in http://packagist.org: [UnexpectedValueException] Could not parse version constraint ~v
    2.0.0-rc1: Invalid version string "~v2.0.0-rc1"
  
  
  
  
  [UnexpectedValueException]
    Could not parse version constraint ~v2.0.0-rc1: Invalid version string "~v2.0.0-rc1"
  </code></pre>
  
  <p>when i trace it on cache folder </p>
  
  <pre><code>"require-dev": {
                      "phpunit\/phpunit": "~4.5",
                      "phpunit\/dbunit": "~1.3",
                      "behat\/mink": "~1.7",
                      "behat\/mink-extension": "~2.1",
                      "behat\/mink-goutte-driver": "~1.2",
                      "behat\/mink-selenium2-driver": "~1.3",
                      "symfony\/dom-crawler": "~2.8",
                      "behat\/behat": "~3.1",
                      "sensiolabs\/behat-page-object-extension": "~v2.0.0-rc1"
                  },
  </code></pre>
  
  <p>it is on not on my require package : composer.json
  it is from symfony/polyfill-mbstring 
  but why on json file they got this?</p>
  
  <pre><code>"packages": {
      "shopware\/shopware": {
          "5.2.x-dev": {
              "name": "shopware\/shopware",
              "description": "Shopware is the next generation of open source e-commerce software made in Germany",
              "keywords": ["shop", "shopware"],
              "homepage": "http:\/\/www.shopware.com",
              "version": "5.2.x-dev",
              "version_normalized": "5.2.9999999.9999999-dev",
              "license": ["AGPL-3.0", "proprietary"],
              "authors": [],
              "source": {
                  "type": "git",
                  "url": "https:\/\/github.com\/shopware\/shopware.git",
                  "reference": "4c4817979a98144e57d9eebc5aa166795e378a1c"
              },
              "dist": {
                  "type": "zip",
                  "url": "https:\/\/api.github.com\/repos\/shopware\/shopware\/zipball\/4c4817979a98144e57d9eebc5aa166795e378a1c",
                  "reference": "4c4817979a98144e57d9eebc5aa166795e378a1c",
                  "shasum": ""
              },
              "type": "project",
              "time": "2016-03-29T06:54:10+00:00",
              "autoload": {
                  "psr-0": {
                      "Doctrine\\Common\\Proxy\\AbstractProxyFactory": "engine\/Library\/",
                      "Doctrine\\ORM\\Persisters\\Entity\\BasicEntityPersister": "engine\/Library\/",
                      "Shopware": "engine\/",
                      "Enlight": "engine\/Library\/",
                      "Zend": "engine\/Library\/",
                      "JSMin": "engine\/Library\/minify\/"
                  },
                  "classmap": ["engine\/Shopware\/Core\/"],
                  "files": ["engine\/Shopware\/Application.php"]
              },
              "include-path": ["engine\/Library\/"],
              "require": {
                  "php": "&gt;=5.5.9",
                  "ext-curl": "*",
                  "ext-mbstring": "*",
                  "ext-gd": "*",
                  "doctrine\/common": "2.5.1",
                  "doctrine\/dbal": "2.5.1",
                  "doctrine\/orm": "2.5.1",
                  "beberlei\/assert": "2.4.0",
                  "zendframework\/zend-escaper": "2.5.1",
                  "oyejorge\/less.php": "1.7.0.5",
                  "guzzlehttp\/guzzle": "5.1.0",
                  "egulias\/email-validator": "1.2.9",
                  "symfony\/http-kernel": "2.8.0",
                  "symfony\/config": "2.8.0",
                  "symfony\/dependency-injection": "2.8.0",
                  "symfony\/validator": "2.8.0",
                  "symfony\/filesystem": "2.8.0",
                  "symfony\/finder": "2.8.0",
                  "symfony\/console": "2.8.0",
                  "symfony\/polyfill-php56": "1.0.0",
                  "monolog\/monolog": "1.17.2",
                  "doctrine\/cache": "1.6.0",
                  "paragonie\/random_compat": "1.1.5",
                  "symfony\/form": "2.8.0",
                  "league\/flysystem": "1.0.18",
                  "elasticsearch\/elasticsearch": "2.1.5",
                  "ongr\/elasticsearch-dsl": "v2.0.0"
              },
              "require-dev": {
                  "phpunit\/phpunit": "~4.5",
                  "phpunit\/dbunit": "~1.3",
                  "behat\/mink": "~1.7",
                  "behat\/mink-extension": "~2.1",
                  "behat\/mink-goutte-driver": "~1.2",
                  "behat\/mink-selenium2-driver": "~1.3",
                  "symfony\/dom-crawler": "~2.8",
                  "behat\/behat": "~3.1",
                  "sensiolabs\/behat-page-object-extension": "~v2.0.0-rc1"
              },
              "replace": {
                  "symfony\/polyfill-php55": "~1.0",
                  "symfony\/polyfill-mbstring": "~1.0"
              },
              "uid": 588566
          }, bla ...............
  </code></pre>