Test with Julia 1.7

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[codecov]

Codecov Report

Merging #32 (6a49a77) into master (ee120b6) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #32   +/-   ##
=======================================
  Coverage   74.31%   74.31%           
=======================================
  Files           1        1           
  Lines         109      109           
=======================================
  Hits           81       81           
  Misses         28       28           

Flag	Coverage Δ
unittests	74.31% <ø> (ø)

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