text: Title: Appimage v0.12.2 has wrong version
  Body: Downloading https://github.com/xonsh/xonsh/releases/download/0.12.2/xonsh-x86_64.AppImage then
  
  ```
  chmod +x xonsh-x86_64.AppImage
  ./xonsh-x86_64.AppImage --version
  ```
  gives
  
  `xonsh/0.11.0`
  