Upgrade koha-salt-docker
Upgrade koha-salt-docker

Include following commits:
54966c2 Upgrade koha-versin to 3.18.04
f1feeb4 Add kohadev subfolder.
87b190a Update README.md
663f97f Improve README.
7bde69b Update Koha 3.18.02 > 3.18.03

digibib/ls.ext,digibib/ls.ext,digibib/ls.ext,digibib/ls.ext