Mermaid doesn't work in latest versions

[khatharsis42]

Ever since version 0.22.0, Mermaid doesn't work anymore. The following code:

```mermaid
graph TD
A[Hard] -->|Text| B(Round)
B --> C{Decision}
C -->|One| D[Result 1]
C -->|Two| E[Result 2]
(closing ticks)

yields the following result:

Note that I've highlighter the text to make it visible.