Add D

[mcandre]

An unofficial package exists for using Cucumber with D language projects, unencumbered. Could we add this to the list of available plugins?

https://docs.cucumber.io/installation/

[xtrasimplicity]

Thanks, @mcandre! I'll take a look at this when I get a moment.

Edit: Looks like I'm not going to have time over the next few weeks, so I'll unassign myself.

[mlvandijk]

Sure. Would you be willing to create a PR for this, @mcandre ?