Add Try.unwrap_or_else

[tkf]

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[codecov]

Codecov Report

Merging #43 (6e5f8c4) into main (6b2c382) will decrease coverage by 0.78%.
The diff coverage is 81.25%.

@@            Coverage Diff             @@
##             main      #43      +/-   ##
==========================================
- Coverage   83.33%   82.54%   -0.79%     
==========================================
  Files           6        6              
  Lines         204      212       +8     
==========================================
+ Hits          170      175       +5     
- Misses         34       37       +3     

Flag	Coverage Δ
Pkg.test	82.54% <81.25%> (-0.79%)	⬇️

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Impacted Files	Coverage Δ
src/Try.jl	66.66% <ø> (ø)
src/branch.jl	80.00% <81.25%> (-3.34%)	⬇️

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