Stop testing on CUDA with Julia 1.5

[tkf]

No description provided.

[codecov]

Codecov Report

Merging #29 (4cab467) into master (ac09e1e) will decrease coverage by 0.63%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #29      +/-   ##
==========================================
- Coverage   69.23%   68.59%   -0.64%     
==========================================
  Files           6        6              
  Lines         208      207       -1     
==========================================
- Hits          144      142       -2     
- Misses         64       65       +1     

Flag	Coverage Δ
unittests	50.97% <ø> (ø)

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Impacted Files	Coverage Δ
src/impl/vectors.jl	76.40% <0.00%> (-1.38%)	⬇️

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