Add missing regions

[harmonherring]

• Adds missing SEA regions to API and DataDragon
• Alphabetizes regions
• Fixes Vietnam language code

[codecov[bot]]

Codecov Report

Merging #56 (495532f) into master (46f565d) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##            master       #56   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           21        21           
  Lines          817       817           
=========================================
  Hits           817       817           

Files Changed	Coverage Δ
datadragon/data_dragon.go	100.00% <ø> (ø)

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