message: Add Arch installation instructions to README
diff: @@ -109,11 +109,17 @@ The easies way to install Gittyup is by using [Flatpak](https://www.flatpak.org/
  Ubuntu:
  sudo apt-get install flatpak && flatpak install flathub com.github.Murmele.Gittyup
  +
  Arch:
  - sudo pacman -S flatpak && flatpak install flathub com.github.Murmele.Gittyup
  +Install the `gittyup` package from the Arch User Repository.
  + git clone https://aur.archlinux.org/gittyup.git
  + cd gittyup
  + makepkg -si
  +Or use an AUR helper.
  +Install `gittyup-git` for the VCS build.
  How to Contribute
  -----------------
  