Move generic derivation instances to fix "diverging implicit expansion" errors

[fthomas]

No description provided.

[codecov]

Codecov Report

Merging #554 into master will decrease coverage by 0.52%.
The diff coverage is 75%.

@@            Coverage Diff             @@
##           master     #554      +/-   ##
==========================================
- Coverage   93.61%   93.08%   -0.53%     
==========================================
  Files          63       65       +2     
  Lines         705      709       +4     
  Branches       11       11              
==========================================
  Hits          660      660              
- Misses         45       49       +4

Impacted Files	Coverage Δ
...ain/scala/eu/timepit/refined/cats/derivation.scala	100% <100%> (ø)
...n/scala/eu/timepit/refined/scalaz/derivation.scala	100% <100%> (ø)
...main/scala/eu/timepit/refined/scalaz/package.scala	75% <50%> (-25%)	⬇️
...c/main/scala/eu/timepit/refined/cats/package.scala	60% <60%> (-40%)	⬇️

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