add combineAll alias for Foldable's fold

[drostron]

resolves #482

[codecov-io]

Current coverage is 64.50%

Merging #523 into master will decrease coverage by -0.11% as of 5ee9043

@@            master   #523   diff @@
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  Files          157    157       
  Stmts         2416   2420     +4
  Branches        66     66       
  Methods          0      0       
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  Hit           1561   1561       
  Partial          0      0       
- Missed         855    859     +4

Review entire Coverage Diff as of 5ee9043

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[adelbertc]

Hm are all our Foldable syntaxes available by just putting it on Foldable? I did not know that.

[drostron]

It's available due to FoldableSyntax extending the simulacrum generated Foldable.ToFoldableOps.

[adelbertc]

Ah right - awesome :-) 👍

[ceedubs]

👍 thanks!