Add laws! Check Basis for Fix/Cofree/Nu/Mu

[andyscott]

No description provided.

[codecov]

Codecov Report

Merging #16 into master will increase coverage by 2.12%.
The diff coverage is 80%.

@@            Coverage Diff             @@
##           master      #16      +/-   ##
==========================================
+ Coverage   76.74%   78.87%   +2.12%     
==========================================
  Files          10       12       +2     
  Lines         129      142      +13     
==========================================
+ Hits           99      112      +13     
  Misses         30       30

Impacted Files	Coverage Δ
modules/core/src/main/scala/qq/droste/basis.scala	100% <ø> (+25%)	⬆️
...laws/src/main/scala/qq/droste/laws/BasisLaws.scala	100% <100%> (ø)
...s/core/src/main/scala/qq/droste/data/package.scala	50% <66.66%> (+4.54%)	⬆️
...main/scala/qq/droste/tests/ScalacheckSupport.scala	80% <80%> (ø)

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