Arbitrary instances for NonEmpty Lists and Vectors

[fthomas]

The instances are defined in CollectionInstancesBinCompat1 so that this change is binary compatible with 0.9.0.

[codecov]

Codecov Report

Merging #486 into master will decrease coverage by 1.25%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #486      +/-   ##
==========================================
- Coverage   94.31%   93.05%   -1.26%     
==========================================
  Files          62       62              
  Lines         668      677       +9     
  Branches       13       12       -1     
==========================================
  Hits          630      630              
- Misses         38       47       +9

Impacted Files	Coverage Δ
...ala/eu/timepit/refined/scalacheck/collection.scala	100% <100%> (ø)	⬆️
...n/scala/eu/timepit/refined/scalacheck/string.scala	100% <100%> (ø)	⬆️

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