For a 0.7.1 release

[ablaom]

• (enhancement) Add user to specify class weights when constructing TunedModel , for passing to measures (#172)
• (convenience) Allow user to specify models as an argument instead of keyword, as in TunedModel(model, tuning=...) (#175)
• Suppress some unecessary "outer layer" caching of training data (#173)

[codecov-commenter]

Codecov Report

Merging #176 (72a9f8d) into master (32b502e) will increase coverage by 0.16%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #176      +/-   ##
==========================================
+ Coverage   87.21%   87.38%   +0.16%     
==========================================
  Files          12       12              
  Lines         618      626       +8     
==========================================
+ Hits          539      547       +8     
  Misses         79       79              

Impacted Files	Coverage Δ
src/tuned_models.jl	93.69% <100.00%> (+0.21%)	:arrow_up:

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