Mermaid version is outdated and doesn't support current diagram language

[brianstringfellow]

I was attempting to create a sequenceDiagram that uses a box. When I enter the following diagram code, the renderer displays a 'Syntax error in graph' message and shows the Mermaid version as 8.8.0 (2020.09.05). As of today, the current version of Mermaid is 11.6.0.

    sequenceDiagram
    box Purple Alice & John
    participant A
    participant J
    end
    box Another Group
    participant B
    participant C
    end
    A->>J: Hello John, how are you?
    J->>A: Great!
    A->>B: Hello Bob, how is Charley?
    B->>C: Hello Charley, how are you?

    sequenceDiagram
    box Purple Alice & John
    participant A
    participant J
    end
    box Another Group
    participant B
    participant C
    end
    A->>J: Hello John, how are you?
    J->>A: Great!
    A->>B: Hello Bob, how is Charley?
    B->>C: Hello Charley, how are you?

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Reference: https://mermaid.js.org/syntax/sequenceDiagram.html#grouping-box

My installed version of Markdown Editor is 0.1.13.

[vincent-zheng]

I forked this repo and update the Mermaid support to the newest version now. You can try it. By the way , I added support for plantuml now.
https://marketplace.visualstudio.com/items?itemName=VincentZheng.polar-markdown-editor&ssr=false#overview