Change row/column index

[taichi-ishitani]

resolve rggen/rggen#210

[codeclimate]

Code Climate has analyzed commit 18e7f55 and detected 0 issues on this pull request.

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[codecov]

Codecov Report

Attention: Patch coverage is 94.11765% with 1 line in your changes missing coverage. Please review.

Project coverage is 99.75%. Comparing base (617730f) to head (18e7f55).

Files	Patch %	Lines
...b/rggen/spreadsheet_loader/spreadsheet/position.rb	92.30%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #54      +/-   ##
==========================================
+ Coverage   99.50%   99.75%   +0.25%     
==========================================
  Files          17       17              
  Lines         401      410       +9     
==========================================
+ Hits          399      409      +10     
+ Misses          2        1       -1     

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