v1.3.1

Initial Release on GitHub.

This release contains a .zip file with the following contents:

• Planets.exe: The executable file of the app. No installation is needed.
• /saves: A folder containing a few example files with predefined planet constellations.

(Even though this is the first Release on this repository, the version number starts at 1.3.1, because there already were previous versions before publishing it on GitHub.)