Changes for version 0.16.0
- Updated GitHub URLs to point to `/pgxn/` rather than `/theory/`.
- Now require SemVer 0.5.0, so that versions must adhere to the semantic version 1.0.0 requirement that the prerelease version, if present, begin with a dash.
- Removed the Pod tests from the distribution.
- validate_pgxn_meta - Validate the structure of a PGXN META.json file
- PGXN::Meta::Validator - Validate PGXN distribution metadata structures