support --format option for import command

[kazupon]

No description provided.

[codecov-io]

Codecov Report

Merging #59 into master will decrease coverage by 0.75%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master      #59      +/-   ##
==========================================
- Coverage    91.1%   90.35%   -0.76%     
==========================================
  Files          11       11              
  Lines         562      570       +8     
  Branches       69       73       +4     
==========================================
+ Hits          512      515       +3     
- Misses         23       25       +2     
- Partials       27       30       +3

Impacted Files	Coverage Δ
src/commands/import.ts	95.83% <ø> (ø)	⬆️
src/commands/export.ts	86.36% <100%> (ø)	⬆️
src/utils.ts	90.64% <54.54%> (-3.25%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update da97552...abebf1e. Read the comment docs.