For devs only: To update a release, make sure to update the following:

- The GitHub Content and releases of:
	- glest-source (+ AppImage release)
	- glest-data
	- windows-binaries
	- windows-installer
	- windows-installer-src
	- io.glest.Glest (+ Flatpak release)

- Update Readme of repos

- The Website:
	- glest.io (version.txt)
	- glest.github.io (version.txt)

- The version number in snapcraft.yaml, io.glest.Glest.json and .travis.yml