add //go:build lines

[shogo82148]

ref. https://golang.org/design/draft-gobuild

[codecov]

Codecov Report

Merging #65 (52f2d61) into main (03a1844) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #65   +/-   ##
=======================================
  Coverage   72.82%   72.82%           
=======================================
  Files          11       11           
  Lines         964      964           
=======================================
  Hits          702      702           
  Misses        191      191           
  Partials       71       71           

Impacted Files	Coverage Δ
connector.go	49.05% <ø> (ø)
find_caller.go	78.26% <ø> (ø)
find_caller_go111.go	72.22% <ø> (ø)

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[coveralls]

Coverage remained the same at 77.192% when pulling 52f2d61 on add-go-build-tag into 03a1844 on main.