3.0.1

CHANGES:

• Remove extra debugging statement (#8, @samoht)
• Adress reviews from @reynir (#7, @samoht and @reynir)
  • Fail when keys contain '.' and '..' to match other mirage-kv-*
    implementations
  • Use failwith instead of Lwt.failwith
  • Use Lwt.reraise instead of Lwt.fail (requires lwt>=5.7)
  • digest on directories now return an error (requires mirage-kv>=6.1.1)
  • set_partial on directories return an error while set on directories work
    (and remove the directory)
  • fix fd leak in set and set_partial