feature_request 增加可选推送渠道

[EileenFengGu]

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请求适配pushplus推送加渠道推送

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通过pushplus推送加文档中心适配推送渠道

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暂时没有

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[luolongfei]

在计划中。

[Thund1R]

已提交增加pushplus通道的PR #153