`orientation = all` is not a valid option yet listed

[Novfensec]

# Valid options are: landscape, portrait, portrait-reverse, landscape-reverse, or all

Below line needs to be updated:

buildozer/buildozer/__init__.py

Line 163 in fea11a1

if o not in ("landscape", "portrait", "landscape-reverse", "portrait-reverse"):

[kuzeyron]

Feel free to fix this with a PR.