Mermaid class diagrams with `<<annotations>>` in simple mode result in mangled output with `remark-rehype`

[SeriousBug]

When using remark-mermaid with remark-rehype, class diagrams that contain <<annotations>> result in a badly escaped output that causes mermaid to throw an error. For example:

classDiagram
class Shape{
    <<interface>>
    noOfVertices
    draw()
}
class Color{
    <<enumeration>>
    RED
    BLUE
    GREEN
}

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The resulting error:

For anyone else encountering this error, we have a fixed fork available: https://www.npmjs.com/package/@dendronhq/remark-mermaid
Repository: https://github.com/dendronhq/remark-mermaid

We'd also be happy to get the fix merged here if this package is still maintained.