Terrarium encoding instead of mapbox encoding

[smellman]

• Mapbox encoding(default)よりもTerrarium encodingの方が精度が高いのでTerrarium encodingを採用したものを実装してみた

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 46.46%. Comparing base (5ef9a4d) to head (b689bf2).
Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #11      +/-   ##
==========================================
+ Coverage   45.91%   46.46%   +0.54%     
==========================================
  Files           2        2              
  Lines          98       99       +1     
  Branches        4        4              
==========================================
+ Hits           45       46       +1     
  Misses         53       53              

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[Kanahiro]

LGTM!