Convert cmd to func

[mpppk]

No description provided.

[codecov-io]

Codecov Report

Merging #58 into master will decrease coverage by 5%.
The diff coverage is 47.29%.

@@            Coverage Diff             @@
##           master      #58      +/-   ##
==========================================
- Coverage   26.86%   21.86%   -5.01%     
==========================================
  Files           6       28      +22     
  Lines         134      709     +575     
==========================================
+ Hits           36      155     +119     
- Misses         97      541     +444     
- Partials        1       13      +12

Impacted Files	Coverage Δ
cmd/create_release.go	11.76% <0%> (ø)
cmd/root.go	27.27% <0%> (ø)
cmd/list_issues.go	18.18% <0%> (ø)
cmd/list.go	22.22% <0%> (ø)
cmd/ibrowse.go	2.43% <0%> (ø)
hlblib/cmd_context.go	0% <0%> (ø)
cmd/list_pullrequests.go	18.18% <0%> (ø)
cmd/create_pullrequest.go	5.81% <0%> (ø)
cmd/browse.go	100% <100%> (ø)
cmd/util.go	37.5% <37.5%> (ø)
... and 28 more

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