Test with Julia 1.7

[tkf]

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[codecov]

Codecov Report

Merging #38 (5b7a98c) into master (7572fea) will decrease coverage by 0.67%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #38      +/-   ##
==========================================
- Coverage   82.12%   81.44%   -0.68%     
==========================================
  Files           7        7              
  Lines         330      345      +15     
==========================================
+ Hits          271      281      +10     
- Misses         59       64       +5     

Flag	Coverage Δ
unittests	81.44% <ø> (-0.68%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/utils.jl	41.86% <0.00%> (-1.73%)	⬇️
src/testing.jl	88.61% <0.00%> (-1.39%)	⬇️
src/collect.jl	86.79% <0.00%> (+0.25%)	⬆️
src/reduce.jl	90.82% <0.00%> (+0.53%)	⬆️
src/interop/onlinestats.jl	85.71% <0.00%> (+2.38%)	⬆️

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