下载的Jekyll模版出现问题：you haven't included the `jekyll-paginate` gem.

      Deprecation: You appear to have pagination turned on, 
      but you haven't included the `jekyll-paginate` gem. 
      Ensure you have `gems: [jekyll-paginate]` in your configuration file.
            Source: /Users/chenkuntao/KarmaChen.github.io
       Destination: /Users/chenkuntao/KarmaChen.github.io/_site
 Incremental build: disabled. Enable with --incremental
      Generating... 
                    done in 0.228 seconds.
                    
       Deprecation: You appear to have pagination turned on, 
       but you haven't included the `jekyll-paginate` gem. 
       Ensure you have `gems: [jekyll-paginate]` in your configuration file.
 Auto-regeneration: enabled for '/Users/chenkuntao/KarmaChen.github.io'
Configuration file: /Users/chenkuntao/KarmaChen.github.io/_config.yml
    Server address: http://127.0.0.1:4000/startbootstrap-clean-blog-jekyll/
  Server running... press ctrl-c to stop.

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需要在 _config.yml 中添加 gems: [jekyll-paginate]

参考：
Jekyll V3.0 requires gems: [jekyll-paginate] in config file on mac OSX El Capitan #4124
https://github.com/jekyll/jekyll/issues/4124