Automate releases using a script
- [x] modify version number - [x] tag - [x] Generate Pyinstaller build - [x] Generate sha256 checksum file Release scripts examples: - [Duniter](https://github.com/duniter/duniter/blob/master/release.sh) - [Sakia](https://github.com/duniter/sakia/blob/master/release.sh) - [Cesium](https://github.com/duniter/cesium/blob/master/release.sh)
issue