Fix testing

[t-bltg]

Those tests once marked broken (#60) seem to pass now.

[codecov]

Codecov Report

Merging #80 (9b1f348) into master (67a2368) will decrease coverage by 0.51%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #80      +/-   ##
==========================================
- Coverage   64.42%   63.90%   -0.52%     
==========================================
  Files           5        4       -1     
  Lines         208      266      +58     
==========================================
+ Hits          134      170      +36     
- Misses         74       96      +22     

Impacted Files	Coverage Δ
src/perspective.jl	75.00% <ø> (+5.00%)	⬆️
src/affine.jl	48.10% <0.00%> (-4.84%)	⬇️
src/core.jl	37.83% <0.00%> (-0.10%)	⬇️
src/CoordinateTransformations.jl
src/coordinatesystems.jl	78.98% <0.00%> (+3.77%)	⬆️

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[c42f]

Thanks, I've added a tweak here to ensure we run CI on more recent Julia versions too. Let's merge if that passes, I guess.