Mermaid does not render arrowheads

[cross-hello]

Current behavior

The output of

graph TB
a[client] --> b[connect]-->c[server]

will be the same as

graph TB
a[client] --- b[connect]---c[server]

which seem missing some arrows.

Expected behavior

It should have a arrow at the final output if I did above sentence.

Steps to reproduce

Environment

• Boostnote version: 0.15.3
• OS version and name:
  Window 7-64bit

[cross-hello]

Here is the preview of the output, it should be some arrows in the yellow circle.
(for the easy to snip the photo, I change the direction to LR = 0 = )

[Flexo013]

Confirmed for Windows 10 as well.

[Flexo013]

This is solved as of Boostnote Legacy version 0.16.0.

Thanks for your contribution @daiyam ❤️