Move naive_bytecount to pedantic

[djc]

As discussed on Zulip, current best practice is to avoid recommending
external crates. This lint is from before that was enforced. Move it
to the pedantic group to avoid enabling it by default.

https://rust-lang.zulipchat.com/#narrow/stream/257328-clippy/topic/naive_bytecount.20suggesting.20extra.20dependency

changelog: move [naive_bytecount] to pedantic

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @Manishearth (or someone else) soon.

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[Manishearth]

@bors r+

Thanks! Added a changelog entry to your PR body so this can land

[bors]

📌 Commit 9e4a064 has been approved by Manishearth

[bors]

⌛ Testing commit 9e4a064 with merge ff51964...

[bors]

☀️ Test successful - checks-action_dev_test, checks-action_remark_test, checks-action_test
Approved by: Manishearth
Pushing ff51964 to master...