Php 试图包含PackageGist上未包含的包的特定分支

我试图使用回购的特定分支，但出现错误：

composer.json

{
    "name": "programmingarehard/arbiter",
    "license": "MIT",
    "type": "library",
    "description": "Convenience library to manipulate Symfony ACL's",
    "authors": [
        {
            "name": "David Adams",
            "email": "adams.david.10@gmail.com"
        }
    ],
    "autoload": {
        "psr-4": {
            "ProgrammingAreHard\\Arbiter\\": "src",
            "ProgrammingAreHard\\Arbiter\\Spec\\": "spec"
        }
    },
    "require": {
        "php": ">=5.3.3",
        "symfony/security": "2.4.*"
    },
    "require-dev": {
        "bestform/phpspec": "dev-psr4-support"
    },
    "config": {
        "bin-dir": "vendor/bin"
    },
    "repositories": [
        {
            "type": "vcs",
            "url": "https://github.com/bestform/phpspec"
        }
    ],
    "minimum-stability": "dev",
    "extra": {
        "branch-alias": {
            "dev-master": "1.0.x-dev"
        }
    }
}

错误：

Updating dependencies (including require-dev)           Your requirements could not be resolved to an installable set of packages.
    Problem 1
    - The requested package bestform/phpspec could not be found in any version, there may be a typo in the package name.   Potential causes:
 - A typo in the package name
 - The package is not available in a stable-enough version according to your minimum-stability setting    see <https://groups.google.com/d/topic/composer-dev/_g3ASeIFlrc/discussion> for more details.   Read <http://getcomposer.org/doc/articles/troubleshooting.md> for further common problems.

更新依赖项（包括require dev）无法将您的需求解析为一组可安装的包。
问题1
-在任何版本中都找不到请求的包bestform/phpspec，包名中可能有输入错误。潜在原因：
-软件包名称中的输入错误
-根据您的最低稳定性设置，该软件包没有足够稳定的版本。有关详细信息，请参阅。阅读了解更多常见问题。

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这是我试图加入我的计划的回购/分行。不知道我做错了什么

您正在使用的存储库不包含名为

bestform/phpspec

的软件。查看其中的composer.json，并使用给定的值“name”。它的

phpspec/phpspec

，只有使用该名称才能找到任何分支

Github存储库的名称与此无关。不要把它和“作曲家”的名字混淆