Heading links containing dashes (-, –, —) don’t work on GitHub

[Moonbase59]

I’m using Atom 1.38.2 and atom-mdtoc 0.8.4. On my GitHub loudgain page, I use mdtoc to generate a TOC as follows:

<!-- MDTOC maxdepth:6 firsth1:2 numbering:0 flatten:0 bullets:1 updateOnSave:1 -->
<!-- /MDTOC -->

Unfortunately, headings containg several hyphens -, endash – or emdash — seem to calculate links that don’t work out. (Try some headings on my page’s TOC like rgbpm.sh – Folder-based loudness and BPM scanning.)

Here are some samples of what mdtoc generates – and what the GitHub link is:

[rgbpm.sh – Folder-based loudness and BPM scanning](#rgbpmsh-–-folder-based-loudness-and-bpm-scanning)   
https://github.com/Moonbase59/loudgain/blob/albummode/README.md#rgbpmsh--folder-based-loudness-and-bpm-scanning

[Default mode `-s i` (`--tag-mode i`)](#default-mode-s-i-tag-mode-i)   
https://github.com/Moonbase59/loudgain/blob/albummode/README.md#default-mode--s-i---tag-mode-i