disable parameter validation by default

[ExpandingMan]

Recently we changed XGBoost.jl so that it warns on invalid parameters by default (and fixed logging so that it goes through the Julia logger).

I really should have made sure this omitted most parameters when I overhauled it in the first place, but the way MLJ model objects work isn't exactly conducive to doing that.

This is admittedly a half-assed fix, but it will prevent users from unnecessarily getting bombarded with invalid parameter warnings.

[ablaom]

This looks fine, thanks. Do you want to update the doc-strings, adding validate_parameters, to the list of hyper-parameters of each model?

[codecov-commenter]

Codecov Report

Merging #30 (a87fa2f) into master (ab061e4) will decrease coverage by 0.43%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master      #30      +/-   ##
==========================================
- Coverage   55.11%   54.68%   -0.44%     
==========================================
  Files           1        1              
  Lines         127      128       +1     
==========================================
  Hits           70       70              
- Misses         57       58       +1     

Impacted Files	Coverage Δ
src/MLJXGBoostInterface.jl	54.68% <0.00%> (-0.44%)	⬇️

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[ExpandingMan]

Do you want to update the doc-strings, adding validate_parameters, to the list of hyper-parameters of each model?

Actually, it doesn't seem the parameters are explicitly documented. Actually this interface conforms with the default of validate_parameters in the xgboost documentation whereas XGBoost.jl does not. I could add a blurb to all the doc strings mentioning it but that seems a bit much. Thoughts?

[ablaom]

Actually, it doesn't seem the parameters are explicitly documented. Actually this interface conforms with the default > of validate_parameters in the xgboost documentation whereas XGBoost.jl does not.

Ok, right. In that case I don't think anything further is needed here.

[ablaom]

Good to go