readme.md: arch linux installation guide: 'pacman' instead of 'packman'

aferrero2707 / PhotoFlow

A fully non-destructive photo retouching program providing a complete layer-based workflow including RAW image development.

http://aferrero2707.github.io/PhotoFlow

GNU General Public License v3.0

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Open gigglylo opened 3 years ago

gigglylo commented 3 years ago

Maybe I miss something. But I'm pretty sure it's 'pacman' instead of 'packman'