fix Vietnam name

[matteocrippa]

I've added another spell for Vietnam

[codecov-io]

Codecov Report

Merging #3 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master       #3   +/-   ##
=======================================
  Coverage   98.43%   98.43%           
=======================================
  Files           2        2           
  Lines          64       64           
=======================================
  Hits           63       63           
  Misses          1        1

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[coveralls]

Coverage remained the same at 98.438% when pulling 87581b7 on matteocrippa:master into 5203263 on meeDamian:master.

[coveralls]

Coverage remained the same at 98.438% when pulling 87581b7 on matteocrippa:master into 5203263 on meeDamian:master.

[PLAhui]

66666

[meeDamian]

Thanks, and sorry for the delay 🙈 - merging in!