CompatHelper: fix URL for HolyLabRegistry

[timholy]

This pull request sets up the CompatHelper workflow on this repository.

[codecov]

Codecov Report

Merging #20 (085e01a) into master (1834a6d) will increase coverage by 4.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #20      +/-   ##
==========================================
+ Coverage   29.44%   33.48%   +4.04%     
==========================================
  Files           1        1              
  Lines         557      642      +85     
==========================================
+ Hits          164      215      +51     
- Misses        393      427      +34     

Impacted Files	Coverage Δ
src/RegisterOptimize.jl	33.48% <0.00%> (+4.04%)	⬆️

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