Extended Markdown Iterator

This crate wraps the event iterator created by [equt_md] to provide a more general while powerful interface.

Difference between those crates

• [equt_md] parses the markdown into event iterator.
• [equt_md_frontmatter] parse the markdown frontmatter into Rust data structure.
• [equt_md_error] contains all errors in these crates.
• [equt_md_ext] wraps and extends the crates above for easy using.
• [equt_md_html] renders the iterator into HTML.