updating to match API updates in SwiftViz

[heckj]

matching API updates to underlying SwiftViz pull request: swiftviz/SwiftViz#7

[codecov]

Codecov Report

Merging #5 (9feda7e) into main (0ed2072) will not change coverage.
The diff coverage is 11.11%.

@@           Coverage Diff           @@
##             main       #5   +/-   ##
=======================================
  Coverage   32.82%   32.82%           
=======================================
  Files           7        7           
  Lines         131      131           
=======================================
  Hits           43       43           
  Misses         88       88           

Impacted Files	Coverage Δ
Sources/SwiftUIViz/HorizontalAxisView.swift	38.09% <0.00%> (ø)
Sources/SwiftUIViz/HorizontalBandView.swift	5.88% <0.00%> (ø)
Sources/SwiftUIViz/VerticalAxisView.swift	16.66% <0.00%> (ø)
...ests/SwiftUIVizTests/HorizontalAxisViewTests.swift	100.00% <100.00%> (ø)
...ests/SwiftUIVizTests/HorizontalBandViewTests.swift	100.00% <100.00%> (ø)
Tests/SwiftUIVizTests/VerticalAxisViewTests.swift	100.00% <100.00%> (ø)

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