Support to upload asset files

[johnmanjiro13]

• Support release asset upload #102

Added --asset-files option to upload asset files when creating a new release.

[codecov]

Codecov Report

Attention: 8 lines in your changes are missing coverage. Please review.

Comparison is base (7041f60) 53.95% compared to head (a8b1b6d) 53.78%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #105      +/-   ##
==========================================
- Coverage   53.95%   53.78%   -0.18%     
==========================================
  Files           5        5              
  Lines         341      357      +16     
==========================================
+ Hits          184      192       +8     
- Misses        139      146       +7     
- Partials       18       19       +1     

Files	Coverage Δ
root.go	91.54% <100.00%> (+0.64%)	⬆️
gh.go	0.00% <0.00%> (ø)
bumper.go	60.55% <37.50%> (-1.08%)	⬇️

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