Implement httphandler in new webhok module.

[tokuhirom]

No description provided.

[codecov-commenter]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (28c1986) 78.89% compared to head (7509b1e) 55.68%.

❗ Current head 7509b1e differs from pull request most recent head a58a509. Consider uploading reports for the commit a58a509 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #384       +/-   ##
===========================================
- Coverage   78.89%   55.68%   -23.21%     
===========================================
  Files          41       86       +45     
  Lines        3714     5414     +1700     
===========================================
+ Hits         2930     3015       +85     
- Misses        592     2179     +1587     
- Partials      192      220       +28     

Files	Coverage Δ
linebot/webhook/parse.go	60.00% <0.00%> (ø)
linebot/webhook/httphandler.go	78.26% <78.26%> (ø)

... and 43 files with indirect coverage changes

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[Yang-33]

Thank you!
I'll update readme!