PATCH: Bump Locale-Codes from 3.18 to 3.20

Attached is a patch to upgrade the Locale-Codes distribution (containing
the core modules Locale::Country, Locale::Language, and
Locale::Currency) to the most recent version.

This release DOES include some added functionality: it now has support 
for retired codes (i.e. codes that are no longer present in the standard).

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Background:

The core modules Locale::Country, Locale::Language, and Locale::Currency
(all part of the Locale-Codes distribution) should be updated on a
regular basis. They contain "codes" from various internet standards
which change over time.

I plan on releasing new versions at four times a year to keep the codes
up-to-date. At this point, I'm not planning on any significant code
changes (other than bug fixes), so the only significant changes
between releases should be to update the codes.

• PATCH: Bump Locale-Codes from 3.18 to 3.20 by Sullivan Beck
• Re: PATCH: Bump Locale-Codes from 3.18 to 3.20 by Chris 'BinGOs' Williams