fn parse_version_heading(line: &str) -> Option<String>Expand description
Parses an ##-level Markdown heading and returns the version string, or
None if the heading does not look like a version entry.
Recognised formats:
## [1.2.0] - 2024-01-15(Keep a Changelog bracketed)## [1.2.0](bracketed, no date)## 1.2.0 - 2024-01-15(unbracketed with date)## 1.2.0(unbracketed, no date)
A leading v prefix is silently stripped from the version string so that
## [v1.2.0] produces "1.2.0", matching the convention used by version
extractors with tag_prefix = "v".