1. Test windows build using mingw:
    $ re2c/autogen.sh
    $ re2c/build_mingw.sh
    $ cd re2c/.build_mingw
    $ make wtests
    $ cd ../..

2. Edit the following files:
    CHANGELOG

3. Run release script:
    $ ./release.sh <version>

4. Update version to .dev

5. Attach tarball (built with release.sh) to autogenerated release on github