CompatHelper: add new compat entry for "Parameters" at version "0.12"

[github-actions]

This pull request sets the compat entry for the Parameters package to 0.12.

This is a brand new compat entry. Previously, you did not have a compat entry for the Parameters package.

Note: I have not tested your package with this new compat entry. It is your responsibility to make sure that your package tests pass before you merge this pull request.

[codecov]

Codecov Report

Merging #13 into master will decrease coverage by 0.16%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #13      +/-   ##
==========================================
- Coverage   88.05%   87.89%   -0.17%     
==========================================
  Files           3        3              
  Lines         226      256      +30     
==========================================
+ Hits          199      225      +26     
- Misses         27       31       +4

Impacted Files	Coverage Δ
src/samplers.jl	94.52% <0%> (-0.76%)	⬇️
src/Hyperopt.jl	86.44% <0%> (+0.72%)	⬆️
src/plotting.jl	70.58% <0%> (+0.82%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update c27f402...87fc679. Read the comment docs.