Fix tag escaping

[mccraveiro]

Marked version: master branch

Markdown flavor: CommonMark

Description

• Related to Defibrillator challenge #1216

Input

\*not emphasized*\<br/> not a tag
\[not a link](/foo)\`not code`
1\. not a list
\* not a list
\# not a heading
\[foo]: /url "not a reference"

Expectation

<p>*not emphasized*
&lt;br/&gt; not a tag
[not a link](/foo)
`not code`
1. not a list
* not a list
# not a heading
[foo]: /url &quot;not a reference&quot;</p>

Result

<p>*not emphasized*
<br/&gt; not a tag
[not a link](/foo)
`not code`
1. not a list
* not a list
# not a heading
[foo]: /url &quot;not a reference&quot;</p>

What was attempted

HTML escaping tag start

Contributor

• Test(s) exist to ensure functionality and minimize regression (if no tests added, list tests covering this PR); or,
• no tests required for this PR.
• If submitting new feature, it has been documented in the appropriate places.

Important: I had to change 2 old tests so they match the spec. Please double check it! :)

Committer

In most cases, this should be a different person than the contributor.

• Draft GitHub release notes have been updated.
• CI is green (no forced merge required).
• Merge PR

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