Adjust to new IndexedTables API

[piever]

Fixes #37

[codecov-io]

Codecov Report

Merging #38 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #38   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          11     10    -1     
  Lines         149    140    -9     
=====================================
- Hits          149    140    -9

Impacted Files	Coverage Δ
src/transform.jl	100% <100%> (ø)	⬆️
src/byrow.jl	100% <0%> (ø)	⬆️
src/apply.jl	100% <0%> (ø)	⬆️
src/utils.jl	100% <0%> (ø)	⬆️

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