Add contributing info
Print usage without logging info (e.g. timestamp)
Don't fail when command exits with non-zero status Some commands, like khard, exit with a failure status when no entries are found. No results is fine, and other address books may have entries that still need to be displayed. Print a warning log instead.
Preserve original case of address Address de-duplication is still case-insensitive.
Remove unneeded trailing tab
Compare addresses case-insensitively
Initial working version