chore: reformat the source code.

[appleboy]

No description provided.

[CLAassistant]

All committers have signed the CLA.

[codecov-io]

Codecov Report

Merging #254 (2933d97) into master (bb85a85) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #254   +/-   ##
=======================================
  Coverage   77.44%   77.44%           
=======================================
  Files          34       34           
  Lines        2181     2181           
=======================================
  Hits         1689     1689           
  Misses        383      383           
  Partials      109      109           

Impacted Files	Coverage Δ
linebot/client.go	68.00% <ø> (ø)
linebot/get_ids.go	78.31% <ø> (ø)
linebot/oauth2.go	86.66% <ø> (ø)
linebot/richmenu.go	58.41% <ø> (ø)
linebot/response.go	66.49% <100.00%> (ø)

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[kkdai]

LGTM