Add Coyoneda tests and remove by

[adelbertc]

Not sure what by does and how the implicit F[A] param would be used.

[codecov-io]

Current coverage is 65.39%

Merging #531 into master will increase coverage by +0.30% as of 1abec02

@@            master    #531   diff @@
======================================
  Files          157     157       
  Stmts         2421    2419     -2
  Branches        66      66       
  Methods          0       0       
======================================
+ Hit           1576    1582     +6
  Partial          0       0       
+ Missed         845     837     -8

Review entire Coverage Diff as of 1abec02

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[non]

Seems good to me. If someone wants to chime in on by usage we can re-add it later.

👍

[ceedubs]

👍