support --normalize option

[kazupon]

close #37

[codecov-io]

Codecov Report

Merging #39 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master      #39   +/-   ##
=======================================
  Coverage   90.58%   90.58%           
=======================================
  Files           7        7           
  Lines         425      425           
  Branches       56       56           
=======================================
  Hits          385      385           
  Misses         18       18           
  Partials       22       22

Impacted Files	Coverage Δ
src/commands/pull.ts	84.44% <100%> (ø)	⬆️
src/commands/push.ts	90.16% <100%> (ø)	⬆️

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