Github italic markdown and other special characters in headers

[buhtz]

I use the Microsoft GitHub style of your toc generator for this content.

## General

### Does _Back in Time_ support full system backups?

foo

### Does _Back in Time_ support backups one cloud storage like OneDrive or Google Drive?

bar

The links for the sub headings (###) do not work because of the _ in the heading. The result is

<!-- TOC start (generated with https://github.com/derlin/bitdowntoc) -->

- [General](#general)
   * [Does _Back in Time_ support full system backups?](#does-_back-in-time_-support-full-system-backups)
   * [Does _Back in Time_ support backups one cloud storage like OneDrive or Google Drive?](#does-_back-in-time_-support-backups-one-cloud-storage-like-onedrive-or-google-drive)

But it should be

<!-- TOC start (generated with https://github.com/derlin/bitdowntoc) -->

- [General](#general)
   * [Does _Back in Time_ support full system backups?](#does-back-in-time-support-full-system-backups)
   * [Does _Back in Time_ support backups one cloud storage like OneDrive or Google Drive?](#does-back-in-time-support-backups-one-cloud-storage-like-onedrive-or-google-drive)

The difference is that the _ should not appear in the anchor link.

This issue is related to a PR in the "Back In Time" project.
bit-team/backintime#1593

EDIT:
Here is another example with an old-school (asscii only) emoticon in the header.

### Which additional features on top of a GUI does BIT provide over a self-configured rsync backup? I saw that it saves the names for uids and gids, so I assume it can restore correctly even if the ids change. Great! :-) Are there additional benefits?
foobar

Wrong:   https://github.com/aryoda/backintime/blob/FAQs/FAQ.md#which-additional-features-on-top-of-a-gui-does-bit-provide-over-a-self-configured-rsync-backup-i-saw-that-it-saves-the-names-for-uids-and-gids-so-i-assume-it-can-restore-correctly-even-if-the-ids-change-great-are-there-additional-benefits
Correct: https://github.com/aryoda/backintime/blob/FAQs/FAQ.md#which-additional-features-on-top-of-a-gui-does-bit-provide-over-a-self-configured-rsync-backup-i-saw-that-it-saves-the-names-for-uids-and-gids-so-i-assume-it-can-restore-correctly-even-if-the-ids-change-great---are-there-additional-benefits

[derlin]

Hello @buhtz, and happy new year! Thank you for using bitdowntoc and reporting the issue.

About the italic, I have to check how other systems are behaving, but this is something that needs to be fixed quickly.

For the ASCII emoji though, handling emojis is already quite hard, and I am not sure I want to spend yet another weekend on this (see my article. I hope this is an edge case that does not happen too often?

Will keep you posted, thanks again for the report!