Fix Issue #76: Limit the number of goroutines

[nao1215]

See #76

[codecov]

Codecov Report

Merging #77 (dfe4707) into main (304c6a8) will decrease coverage by 2.45%.
The diff coverage is 81.81%.

@@            Coverage Diff             @@
##             main      #77      +/-   ##
==========================================
- Coverage   91.25%   88.80%   -2.45%     
==========================================
  Files          12       12              
  Lines         480      563      +83     
==========================================
+ Hits          438      500      +62     
- Misses         27       43      +16     
- Partials       15       20       +5     

Impacted Files	Coverage Δ
cmd/check.go	85.71% <60.86%> (-10.78%)	⬇️
cmd/update.go	68.96% <70.37%> (-3.20%)	⬇️
cmd/import.go	86.36% <81.25%> (-3.96%)	⬇️
cmd/completion.go	100.00% <100.00%> (ø)
cmd/export.go	87.03% <100.00%> (+2.59%)	⬆️
cmd/list.go	100.00% <100.00%> (ø)
cmd/remove.go	92.50% <100.00%> (+1.07%)	⬆️
cmd/root.go	100.00% <100.00%> (ø)
cmd/version.go	100.00% <100.00%> (ø)
... and 5 more

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