Narrow Option.mapN return type to exclude

[OliverJAsh]

Fixes #69

[codecov]

Codecov Report

Merging #70 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #70   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          24     24           
  Lines        2628   2628           
  Branches      434    434           
=====================================
  Hits         2628   2628

Impacted Files	Coverage Δ
packages/funfix-core/src/disjunctions.ts	100% <100%> (ø)	⬆️

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[OliverJAsh]

How does this look? :-)

[alexandru]

Looking good :-) will release a new minor version.

[alexandru]

@OliverJAsh I released v6.2.2