Bug: HTML in markdown files gets converted into plain text

[lyu4321]

In GitHub, markdown files can include HTML tags, which will be displayed as HTML. For example

<strong>Hello</strong>

Will be displayed as

Hello

markdown-it converts all angle brackets to < or > so in the generated HTML files, these are displayed as plain text and not as HTML. It would be nice to be able to include HTML in markdown files to provide more options to users.