chore: test against 1.15 and 1.16

[thinkingserious]

Checklist

• [x] I acknowledge that all my contributions will be made under the project's license

[codecov[bot]]

Codecov Report

Merging #87 (a39e333) into main (48ec117) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##              main       #87   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           84        84           
=========================================
  Hits            84        84           

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