Change columns and rows to 1-based

[kitagry]

Most of linters use 1-based value for row and col. But, tree-sitter use 0-based rows and cols.

https://docs.rs/tree-sitter/latest/tree_sitter/struct.Point.html

[codecov-commenter]

Codecov Report

Merging #10 (637724a) into main (e4db329) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #10   +/-   ##
=======================================
  Coverage   52.54%   52.54%           
=======================================
  Files           1        1           
  Lines         177      177           
=======================================
  Hits           93       93           
  Misses         84       84           

Impacted Files	Coverage Δ
src/main.rs	52.54% <100.00%> (ø)

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[hirosassa]

LGTM!