Support keyboard interrupt

[hiroebe]

What

• Handle os.Interrupt signal and propagate cancellation using context
• Add defer spinner.Stop() to ensure that the spinner is stopped and cleaned up

Why

Current implementation does not handle keyboard interrupt, which causes unexpected side effect to the shell: When I input ctrl-c while a spinner is running (with the message Fetching pull requests... for example), the cursor is still hidden even after the command finished.

[codecov[bot]]

Codecov Report

Merging #81 (54aff6b) into main (cbf197b) will increase coverage by 0.07%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #81      +/-   ##
==========================================
+ Coverage   88.29%   88.36%   +0.07%     
==========================================
  Files           3        3              
  Lines         615      619       +4     
==========================================
+ Hits          543      547       +4     
  Misses         54       54              
  Partials       18       18              

Impacted Files	Coverage Δ
main.go	77.86% <100.00%> (+0.69%)	:arrow_up:
poi.go	90.75% <100.00%> (ø)

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[seachicken]

Wow, I wasn't aware of the problem. Thanks for the great fix 😃