Include a way to require more than one reviewer for a pull-request

Currently, my team requires two 'approved' reviews to allow a PR to be merged, but there's no way to enforce it on Github. I'd like to request the ability to restrict merges of PRs without a user-defined number of 'approved' reviews.

没有指定文件、测试或入口点。首先定位这个 JavaScript GitHub wrapper 中的 pull-request 和 review API 接口，然后确定所请求的用户定义审批数量如何融入项目。完成这项工作需要明确的实现范围，以及用于根据多个已批准的 review 限制合并的测试。

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