add Vietnam region & Sea route (constants.go)

[nggialac]

Platform/Host: VN2/vn2.api.riotgames.com

Regional Routing SEA: sea.api.riotgames.com

Docs was updated: https://developer.riotgames.com/docs/lol

[nggialac]

I think that is ok, glad to be helpful

[codecov[bot]]

Codecov Report

Merging #55 (b58b399) into master (e9a630a) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##            master       #55   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           21        21           
  Lines          817       817           
=========================================
  Hits           817       817           

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