Convert github markdown with mermaid diagrams to beautiful PDF

• PhantomJS

gem install wing

mkdir my-doc
cd my-doc
wing init

wing gen

```diagram
graph LR
    A[Square Rect] -- Link text --> B((Circle))
    A --> C(Round Rect)
    B --> D{Rhombus}
    C --> D
```

1. Fork it ( https://github.com/monterail/wing/fork )
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create a new Pull Request