ruby-ulid 0.2.0

The ULID(Universally Unique Lexicographically Sortable Identifier) has useful specs for applications (e.g. `Database key`), especially possess all `uniqueness`, `randomness`, `extractable timestamps` and `sortable` features. This gem aims to provide the generator, monotonic generator, parser and handy manipulation features around the ULID. Also providing `ruby/rbs` signature files.