Creates UML diagrams from plain text description.

Sequence diagrams:

    More info```sequence
    Alice->Bob: Hello Bob, how are you?
    Bob-->Alice: I am good thanks!
    ```

Flow charts:

    More info```flow
    st=>start: Start
    e=>end
    op=>operation: My Operation
    cond=>condition: Yes or No?
    st->op->cond
    cond(yes)->e
    cond(no)->op
    ```

> Note: Markdown Extra extension has to be enabled with GFM fenced code blocks option.