升级适配Hexo 7.0

[appotry]

改动很少 ，两处修改 https://github.com/hexojs/hexo/releases/tag/v7.0.0

Hexo 7 不再使用gist, youtube, jsfiddle, and vimeo 这几个tag ，如果要使用，需要单独安装插件

Some of the built-in tags have been dropped (gist, youtube, jsfiddle, and vimeo). If you use those tags in your existing blog posts, you can install hexo-tag-embed to continue using them with Hexo v7.0.0.

$ npm i hexo-tag-embed

代码高亮配置方式需要修改

Syntax highlighting is refactored and controlled by the following settings. See Syntax Highlighting for more details.

syntax_highlighter: highlight.js # highlight.js | prismjs | <empty>

已经用上了 hexo 7 版本，升级后暂时没发现什么bug

[appotry]

发现 7.1 存在bug tag 换行解析错误
hexo 7.0正常

npm i hexo@7.0.0 --save