Yaml definitions on Handlebars files

[Lukas238]

The bug

I have a handlebar file with YAML declarations on top.

---
layout: default
page_id: upgrades
body_css: page-upgrades
---
<section id="content">
    <article>
        <h2>Title</h2>
        <p>Lorem ipsum dolo sit amet.</p>
    </article>
</section>

After I beautify it the YAML declaration is modified:

-- -layout : default
page_id : upgrades
body_css : page - upgrades
-- - <section id="content">
    <article>
        <h2>Title</h2>
        <p>Lorem ipsum dolo sit amet.</p>
    </article>
</section>

System (please complete the following information):

• OS: macOS
• Version: Mojave

Additional information:
This way to include YAML in a handlebar file is part of the workflow of https://assemble.io/ gulp static site generator.

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