v0.2.0

New version!

• BREAKING: add <path> subcommand doesn't increment registered directories anymore

• NEW: inc <path> replaces the previous add <path> subcommand's behaviour

• NEW: query <path> --checked to find the first existing directory (previous ones will be removed from database)

• NEW: optimize subcommand to optimize database

• PERF: Switch to a HashMap instead of using a BTreeMap

• STABILITY: Automatically check when database changes need to be flushed to the disk