Add Bimonad instance to NEL and NEV

[LukaJCB]

No description provided.

[codecov-io]

Codecov Report

Merging #2219 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #2219   +/-   ##
=======================================
  Coverage   95.05%   95.05%           
=======================================
  Files         333      333           
  Lines        5789     5789           
  Branches      211      211           
=======================================
  Hits         5503     5503           
  Misses        286      286

Impacted Files	Coverage Δ
core/src/main/scala/cats/data/NonEmptyList.scala	100% <100%> (ø)	⬆️
core/src/main/scala/cats/data/NonEmptyVector.scala	100% <100%> (ø)	⬆️

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