Making Releases

1. Update version variables in CMakeLists.txt
   • Also update build/linux/io.github.cxong.cdogs-sdl.appdata.xml with release version
2. Make a GitHub release (instructions) (release notes style), mark as pre-release
   • Separate Game and Editor sections
   • Look at the release milestone as well as commits since the last release for changes, and write the release notes
   • Windows, macOS, Linux platforms will be automatically built by Github Actions / Appveyor
3. Test under platforms: Windows XP, Windows Vista/7/8/10, Linux, macOS
   • Test both game and editor
4. Make new blog post at http://cxong.github.io/cdogs-sdl/
   • Make and include any screenshots showing new features
5. Spread the word!