Add Ior.fromOptions

[ceedubs]

(Option[A], Option[B]) => Option[A Ior B]

[ceedubs]

I'm not particularly attached to the name, so feel free to speak up if you have a suggestion.

[codecov-io]

Current coverage is 75.71%

Merging #567 into master will decrease coverage by -0.02% as of db84f50

@@            master    #567   diff @@
======================================
  Files          157     157       
  Stmts         2155    2158     +3
  Branches        68      68       
  Methods          0       0       
======================================
+ Hit           1632    1634     +2
  Partial          0       0       
- Missed         523     524     +1

Review entire Coverage Diff as of db84f50

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[stew]

👍

[adelbertc]

👍