:sparkles: `EventKind`に`derive(Hash)`を追加

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 96.12%. Comparing base (a0cb68f) to head (5fb4bf7).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #222 +/- ## ======================================= Coverage 96.12% 96.12% ======================================= Files 13 13 Lines 1238 1238 ======================================= Hits 1190 1190 Misses 48 48 ```

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