Tz - time zone support for Elixir (alternative to Tzdata that comes with a lot of bugfixes)

[LostKobrakai]

@mathieuprog

for every iana tz database update, the Tz dependency will have to be updated

Does this mean bugfixes will be locked to the current IANA db and users will be forces to switch tz database if it changed in between installation and a bugfix?