Fix197b

[tlienart]

• removes the Parameters dep
• brings back the kw constructors

(actually works; previous pr attempt had other commits mixed in and it became messy)

[codecov-io]

Codecov Report

Merging #201 into master will increase coverage by 0.1%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master     #201     +/-   ##
=========================================
+ Coverage   71.47%   71.57%   +0.1%     
=========================================
  Files          19       19             
  Lines        1413     1418      +5     
=========================================
+ Hits         1010     1015      +5     
  Misses        403      403

Impacted Files	Coverage Δ
src/MLJ.jl	100% <ø> (ø)	⬆️
src/resampling.jl	81.3% <100%> (+0.53%)	⬆️
src/tuning.jl	72.38% <100%> (+0.53%)	⬆️
src/composites.jl	84.02% <100%> (ø)	⬆️

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