Backport #3099 to scala_2.11 branch

[gagandeepkalra]

addresses #3143

[codecov-io]

Codecov Report

Merging #3249 into scala_2.11 will decrease coverage by 0.05%.
The diff coverage is 83.33%.

@@              Coverage Diff               @@
##           scala_2.11    #3249      +/-   ##
==============================================
- Coverage        93.5%   93.45%   -0.06%     
==============================================
  Files             383      383              
  Lines            7149     7153       +4     
  Branches          193      196       +3     
==============================================
  Hits             6685     6685              
- Misses            464      468       +4

Impacted Files	Coverage Δ
...tances/ScalaVersionSpecificParallelInstances.scala	0% <0%> (-90.91%)	⬇️
core/src/main/scala/cats/instances/stream.scala	97.4% <100%> (+0.18%)	⬆️
core/src/main/scala/cats/instances/vector.scala	100% <100%> (ø)	⬆️
core/src/main/scala/cats/instances/list.scala	100% <100%> (ø)	⬆️
core/src/main/scala/cats/instances/either.scala	100% <100%> (ø)	⬆️

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[rossabaker]

Did this cherry-pick fairly clean? I don't see any mistakes, and tests pass, so I'm inclined to think it's right. But if there's any area that you think deserves extra scrutiny, I'll look harder.

[gagandeepkalra]

Actually I didn't cherry-pick, it made things more convoluted given this had a few version specific changes. I went file by file, some experimenting along the way.

[rossabaker]

Okay, still looks right to me.