adds region "south-eastern-asia"

[pbedat]

A small one to add the missing region "south-eastern-asia" as defined here: https://docs.oasis-open.org/cti/stix/v2.1/os/stix-v2.1-os.html#_i1sw27qw1v0s

[codecov[bot]]

Codecov Report

Merging #54 (6e35a2f) into master (9847112) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #54   +/-   ##
=======================================
  Coverage   99.30%   99.30%           
=======================================
  Files          44       44           
  Lines        2009     2009           
=======================================
  Hits         1995     1995           
  Misses          7        7           
  Partials        7        7           

Impacted Files	Coverage Δ
location.go	100.00% <ø> (ø)

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