feat: add a type alias for Result<(), ExitFailure>

[tismith]

[codecov[bot]]

Codecov Report

Merging #26 into master will not change coverage. The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #26   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           2      2           
  Lines          62     62           
=====================================
  Hits           62     62

Impacted Files	Coverage Δ
src/lib.rs	100% <ø> (ø)	:arrow_up:

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