v7 -> v8

[Yang-33]

https://github.com/line/line-bot-sdk-go/releases/tag/v8.0.0 has been released!

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (5b2f50d) 55.75% compared to head (cd332ee) 55.75%.
Report is 1 commits behind head on master.

❗ Current head cd332ee differs from pull request most recent head 1f4cb26. Consider uploading reports for the commit 1f4cb26 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #395   +/-   ##
=======================================
  Coverage   55.75%   55.75%           
=======================================
  Files          86       86           
  Lines        5406     5406           
=======================================
  Hits         3014     3014           
  Misses       2172     2172           
  Partials      220      220           

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