Mention "Bytes" on README.md and lib.rs

[ryoqun]

I think #277 can be more promoted. :)

As I wrote the current status of serialization of const generics like bytes (solana-labs/solana#29196 (comment)), i think "Bytes" is best solution so far.

@jonasbb hey, this functionary saved us. however it took a while to spot this. I think Bytes can be promoted. :)

[codecov]

Codecov Report

Merging #536 (bb695a4) into master (d06b021) will not change coverage.
The diff coverage is n/a.

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  Misses       1113     1113           

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[jonasbb]

Hi, I'm glad you found this crate useful :). The lack of const-generic support in serde_bytes seems to come up from time to time, so calling out support for it in the README could be useful. Thanks for the PR.

bors r+

[bors]

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