Markdown --- highlighting for headings

[jhannwong]

[Short description of problem here]

It seems Markdown headings are not highlighted.

Reproduction Steps:

1. Install theme (ui and syntax)
2. Create Markdown file with headings.
3. See the lack of highlighting for headings.

Expected behavior:

[Describe expected behavior here]

Headings should be highlighted.

Observed behavior:

[Describe observed behavior here]

Headings not highlighted.

Screenshots and GIFs

None deemed necessary.

Atom version: 1.27.1 x60
OS and version: MacOS High Sierra 10.13.4

Installed packages:

[List of installed packages here]

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