Correct "Viet Nam" to "Vietnam"

[morajabi]

Based on https://en.wikipedia.org/wiki/ISO_3166-2:VN

[coveralls]

Coverage remained the same at 98.438% when pulling 30a2fe4 on morajabi:patch-1 into 5203263 on meeDamian:master.

[codecov-io]

Codecov Report

Merging #4 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master       #4   +/-   ##
=======================================
  Coverage   98.43%   98.43%           
=======================================
  Files           2        2           
  Lines          64       64           
=======================================
  Hits           63       63           
  Misses          1        1

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