Cases when backslash should not be shown

[Disonantemus]

Describe the bug
Glow render backslash, in cases that should not. Bellow there are two cases, maybe there are more. Tested with lowdown and all (8) the online editors at the end with same result.

Setup

• OS: Arch
• Shell: bash
• Terminal: st
• Multiplexer: tmux
• Locale: es

To Reproduce

1. Backslash previous to square bracket: \[ or \]

$ echo "\[Should not show backslash\]" | glow
  \[Should not show backslash\]

$ echo "\[Should not show backslash\]" | lowdown | w3m -T text/html -dump
[Should not show backslash]

2. ***

$ echo '\***' | glow
  \***
$ echo '\*\**' | glow
  \*\**
$ echo '\*\*\*' | glow
  \*\*\*

$ echo '\***' | lowdown | w3m -T text/html -dump
***
$ echo '\*\**' | lowdown | w3m -T text/html -dump
***
$ echo '\*\*\*' | lowdown | w3m -T text/html -dump
***

Expected behavior
Lowdown output.

Reference URLS:
Glamour Issue #274
Lowdown
Markdown: Dingus
Commonmark
Minimalist Online Markdown Editor
Markdown Live Preview
Markdown Editor
Dillinger: The Last Markdown Editor, Ever
StackEdit
markdown-it