加载官方谷歌PHP API客户端作为一个作曲家需要

我正在编写一个库作为编写器包，它需要官方的PHP Google API客户端。这个api客户端只能在Github上找到——packagists上的版本只是分叉，似乎不经常更新。

我在添加官方API客户端作为包的依赖项时遇到了一个问题。你知道我做错了什么吗?

{
    "name": "mechastorm/google-spreadsheet-extractor",
    "require": {
        "google/google-api-php-client": "dev-master"
    },
    "require-dev": {
        "google/google-api-php-client": "dev-master",
        "phpunit/phpunit": "~4.0",
        "mockery/mockery": "~0.9"
    },
    "minimum-stability" : "dev",
    "repositories": [
        {
            "type": "vcs",
            "url": "https://github.com/google/google-api-php-client.git"
        }
    ],
    "autoload": {
        "psr-0" : {
            "mechastorm''google-spreadsheet-extractor" : "src"
        }
    }
}

Your requirements could not be resolved to an installable set of packages.
  Problem 1
    - Installation request for mechastorm/google-spreadsheet-extractor dev-master -> satisfiable by mechastorm/google-spreadsheet-extractor[dev-master].
    - mechastorm/google-spreadsheet-extractor dev-master requires google/google-api-php-client dev-master -> no matching package found.
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.