chore: bump version to 2.0.0 (major)

chore: bump version to 1.6.0 (minor)

doc: update README

refactor: bump version

feat: add empty security card craft (#7)

feat: add whitelist security card

Added a security card inventory in which whitelist can be set on/off
To give a player access to the deep storage unit, a security card must be inserted, of which he is the owner, if the whitelist is activated

bump version

Update README.md