Update from version 0.83.1 to 0.84.

Upstream changes:

0.84    2009-01-21

- This release is based on version 2009a of the Olson
  database. Changes include spelling "Katmandu" as "Kathmandu" (with a
  link for the old spelling), fixes for historical rules in
  Switzerland, and changes to America/Resolute and Cuba for the past
  few years (but not present).

- If DateTime::TimeZone::Local could not load its OS-specific subclass
  because of a missing dependency, it would silently fall back on
  loading the Unix subclass, rather than throwing an error. RT #41305.

- Fixed a bug where the short names for some time zones were
  wrong. This mostly (exclusively?) manifested in time zone rules for
  the first half of the 20th century or so.

(he)