#115: add upgrade command and fix last '%' on progress bar

[kcmvp]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 53.84615% with 36 lines in your changes missing coverage. Please review.

Project coverage is 65.28%. Comparing base (42b8c83) to head (63d79fd).

Files	Patch %	Lines
cmd/gbc/command/deps.go	42.42%	19 Missing ⚠️
cmd/gbc/artifact/pty_writer.go	59.25%	7 Missing and 4 partials ⚠️
cmd/gbc/artifact/project.go	37.50%	4 Missing and 1 partial ⚠️
cmd/gbc/command/build_action.go	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #116      +/-   ##
==========================================
- Coverage   66.66%   65.28%   -1.39%     
==========================================
  Files          21       23       +2     
  Lines        1110     1178      +68     
==========================================
+ Hits          740      769      +29     
- Misses        313      351      +38     
- Partials       57       58       +1     

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