Add CompatHelper

[codecov[bot]]

Codecov Report

Merging #124 (45a89e6) into main (7e0efc6) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##              main      #124   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines          137       164   +27     
=========================================
+ Hits           137       164   +27     

Impacted Files	Coverage Δ
src/Quaternion.jl	100.00% <0.00%> (ø)

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[sethaxen]

There are a few different CompatHelper workflows floating around, all of which seem to work but maybe have some failure modes. Where does this one come from? I noticed it doesn't match the ones in the CompatHelper repo https://github.com/JuliaRegistries/CompatHelper.jl/blob/master/.github/workflows/CompatHelper.yml or the PkgTemplates repo: https://github.com/JuliaCI/PkgTemplates.jl/blob/master/templates/github/workflows/CompatHelper.yml

[hyrodium]

Oh sorry, my mistake. I copied this file from my other package. I thought the package has the latest CompatHelper.yml provided from CompatHelper.jl, but that was not correct.