Fix bug: d should be domain

[codecov[bot]]

Codecov Report

Merging #188 (509a271) into main (2053510) will not change coverage. The diff coverage is 0.00%.

@@           Coverage Diff           @@
##             main     #188   +/-   ##
=======================================
  Coverage   52.20%   52.20%           
=======================================
  Files          29       29           
  Lines        5821     5821           
=======================================
  Hits         3039     3039           
  Misses       2782     2782           

Impacted Files	Coverage Δ
src/Domain.jl	60.28% <0.00%> (ø)

:mega: Codecov can now indicate which changes are the most critical in Pull Requests. Learn more

[hwpang]

@mjohnson541 All tests have passed!