contravariant.md [reversing roles of A and B in commentary to match the code]

[phderome]

that says that B is subtype of A.

See also gitter discussion with @tpolecat on Jan 14 2017.

[phderome]

Luka, @tpolecat had additional clarification/suggestion in gitter that I missed, not sure what to do with it:

Or A <= B implies F[A] => F[B] which is the same statement in a different category.

I think we could do better explaining the relationship.

[codecov-io]

Codecov Report

Merging #2154 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2154   +/-   ##
=======================================
  Coverage   94.67%   94.67%           
=======================================
  Files         328      328           
  Lines        5538     5538           
  Branches      224      199   -25     
=======================================
  Hits         5243     5243           
  Misses        295      295

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