Redmine.Backlogs 插件安装

1. 安装 1.1. 检查Redmine配置 Just re-run the bundler call you executed during redmine install bundle install –without development test rmagick 1.2. 安装holidays gem 1.0.4 holidays 1.0.4直接安装有bug，首先安装1.0.3再升级可以

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