v2.21

• Use RFC 2119 terms for CPAN purl type specification (@sjn)
• Added "swid" purl type support
• Moved normalization and validation check in "URI::PackageURL::Util"
• Dropped support for "version_prefix" qualifier for "github", "gitlab" and "bitbucket" PURL types in "purl_to_urls" util (@pombredanne via #14)

v2.20

• Added support for the official "cpan" PURL type specification (#8)
• Added "Version Range" (vers) support
• Added "URI::VersionRange::Version::cpan" version comparator for "cpan" scheme
• Added "vers-tool(1)"
• FIX Apply percent-encoding in "subpath" in "to_string" method

v2.11

• Improved the cpan PURL type to be compatible with the 'PURL-TYPES' specification (#8 - https://github.com/package-url/purl-spec/blob/master/PURL-TYPES.rst)
• Added "luarocks" PURL type support
• Improved test suite (#11)
• Renamed CLI package in "URI::PackageURL::App"
• Changed JSON module pre-requisite to "JSON::PP" to be compatible with CPAN Toolchain (#12)

Full Changelog: v2.04...v2.11

Improvements and fixes

• Improved validation during encode and decode "purl" string
• Fixed CPAN repository URL
• FIX Qualifiers are case sensitive (#4)
• FIX PURLs containing multiple namespaces segments parse incorrectly (#5)
• FIX Incorrect parsing of PURLs that begin with "pkg:/" (#6)
• Improved "t/99-official-purl-test-suite.t" test

v2.02: Fix official test suite

#4

v2.01

Added "repository_url" support for "cpan" PURL type

v2.00

• Added "purl-tool(1)" (#3)
• Added "URI::PackageURL::Util::purl_to_urls" helper
• Fixed name qualifier for "cpan" (#2)
• Fixed some little issues

v1.10: Small fixes

- Fixed "namespace vs name" (RT#143917)
- Fixed substitution warning when "version" component is not provided in URI::PackageURL->from_string

v1.02

Fix decode when "namespace" component is undef

v1.01

Small fixes