Set up scala-steward

[codecov[bot]]

Codecov Report

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

Project coverage is 93.76%. Comparing base (8a1b192) to head (4cdc32c).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #83 +/- ## ======================================= Coverage 93.76% 93.76% ======================================= Files 14 14 Lines 513 513 Branches 110 110 ======================================= Hits 481 481 Misses 32 32 ``` | [Flag](https://app.codecov.io/gh/tarao/record4s/pull/83/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=INA+Lintaro) | Coverage Δ | | |---|---|---| | [3](https://app.codecov.io/gh/tarao/record4s/pull/83/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=INA+Lintaro) | `93.76% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=INA+Lintaro#carryforward-flags-in-the-pull-request-comment) to find out more.

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