Changelog:
==========
-Document calendar-based versioning scheme
-Enforce that the entire marker string is parsed
-Requirement parsing no longer automatically validates the URL
-Canonicalize names for requirements comparison
-Introduce metadata.Metadata
-Introduce the validate keyword parameter to utils.validate_name()
-Introduce utils.is_normalized_name()
-Make utils.parse_sdist_filename() and utils.parse_wheel_filename() raise
InvalidSdistFilename and InvalidWheelFilename, respectively, when the
version component of the name is invalid
Signed-off-by: Wang Mingyu <wangmy@fujitsu.com> Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>