Revision history for PostgreSQL extension semver.

0.4.0  2013-06-12T06:48:33Z
      - Updated the `Makefile` to reflect the recommended patterns from
        pgsql-hackers. Thanks to Cédric Villemain for the details.
      - Changed the Makefile to read the distribution name and version from
        META.json.
      - Fixed the Makefile to allow `PG_CONFIG=/path/to/pg_config` to actually
        work.
      - Fixed an off-by-one bug in the parser that could add garbage
        characters to the end of certain semvers with patch versions. Thanks
        to Andrew "RhodiumToad" Gierth for pointing out the bug.
      - Add a macro to fetch a semver from C function arguments, and cast to
        `semver*` rather than `void*`. Suggested by Andrew "RhodiumToad"
        Gierth.
      - Removed unnecessary calls to `PG_FREE_IF_COPY()`. Only really needed
        for toastable values, and semvers are not toastable.

0.3.0  2012-11-20T19:04:30Z
      - Updated the parser to support an optional dash before the prerelease
        version, and the formatter to always emit a dash for the prerelease
        version. This brings it in line with the final semver 1.0.0
        specification. Thanks to Pieter van de Bruggen for making it happen.

0.2.4  2012-11-02T22:32:30Z
      - Fixed a memory allocation bug that could cause semvers to be displayed
        with missing or garbage characters. Thanks to Andrew "RhodiumToad"
        Gierth for help tracking down and fixing the issue.

0.2.3 2011-11-11T06:55:10Z
      - Fixed the `Makefile` so that the documentation file should properly be
        found and installed by `PGXS`.

0.2.2   2011-05-12T19:01:41
      - Tweaked MultiMarkdown table layout in the docuemntation so that the
        header row is always processed as a header row, rather than a `pre`
        block.
      - Simplified the `CREATE EXTENSION` support in the `Makefile`.

0.2.1 2011-04-20T20:37:05
      - Fixed the metadata file to reflect that the "pair" extension is not
        included in the semver distribution.
      - Added abstract and doc file to the `provides` section of `META.json`.
      - Removed the `NO_PGXS` stuff from `Makefile`, as the PostgreSQL core
        team does not recommend its use outside of the core contrib
        extensions.
      - Added PostgreSQL 9.1 `CREATE EXTENSION` support, including migration
        from an unpackaged install via `CREATE EXTENSION semver FROM
        unpackaged`.
      - Renamed `doc/semver.md` to `doc/semver.mdd`, so that PGXN will parse
        it as MultiMarkdown. This will allow the tables to be properly
        formatted.
      - Removed documentation that semver is implemented as a domain. It
        hasn't been since 0.2.0.
      - Removed Unicode characters `psql` output in the documentation.

0.2.0 2011-02-05T19:32:49
      - Converted to a native type implemented in C by Sam Vilain. While David
        was at lunch, no less.
      - As a consequence, `USING` is no longer required in an `ORDER BY`
        clause to get proper semver sort ordering.
      - Added casts from nuermic types.
      - Renamed `clean_semver()` to `to_semver()`.

0.1.0  2010-10-07 18:31:43
      - Initial version.
      - Implementation in pure PL/pgSQL.
      - Included in [PGXN Manager](https://github.com/theory/pgxn-manager).
      - Not otherwise released.