Bug Report: NetSuite::Support::Country ignores lowercase ISO country codes

[13-Sonal]

The NetSuite::Support::Country initializer only maps uppercase ISO country codes (e.g., "IN"), but fails silently for lowercase inputs (e.g., "in"), resulting in an invalid @id.

Steps to Reproduce:

NetSuite::Records::Address.new(
  addressee: "Test Company",
  country: "IN"
)
# => @id = "_india"

NetSuite::Records::Address.new(
  addressee: "Test Company",
  country: "in"
)
# => @id = "in" (invalid)

Expected Behavior:
The country input should be normalized (e.g., upcase) before lookup, so both "IN" and "in" map to "_india".

Suggested Fix:
In NetSuite::Support::Country#initialize:

if iso_or_name.to_s.upcase =~ /^[A-Z]{2}/
  @id = iso_to_netsuite.fetch(iso_or_name.to_s.upcase)

Gem Version - netsuite (0.9.3)
Ruby Version - ruby 2.7.8p225 (2023-03-30 revision 1f4d455848)