Bug with embedding discourse

[ghutchis]

• This is a question about using the theme.
• I believe this to be a bug with the theme --- not Jekyll, GitHub Pages or one of the bundled plugins.
• This is a feature request.
• I have updated all gems with bundle update.
• I have tested locally with bundle exec jekyll build.

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Environment informations

• Minimal Mistakes version: 4.2.1
• github-pages or jekyll gem version: 3.4.0
• Operating system: MacOS 10.12

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Expected behavior

Based on the docs, I expect to embed Discourse comments from my server.

Steps to reproduce the behavior

See source of http://avogadro.org/news/avogadro-1-90-released/

I believe that _includes/comments.html needs a when case for "discourse"

{% when "discourse" %}
    <h4 class="page__comments-title">{{ comments_label }}</h4>
    <section id="discourse-comments"></section>

The resulting site has the embedded Discourse forum.

[mmistakes]

@ghutchis Care to submit a pull request to the develop branch with the fix?