chore(deps): update rlp requirement from 0.5 to 0.6

[dependabot[bot]]

Updates the requirements on rlp to permit the latest version.

Commits

• 5be22d3 fix rlp version
• eeaacc3 bump rlp-derive version
• 63c5afb Bump versions (#860)
• 0db43ee Remove From [u8; n] impl for uint types (#859)
• 701148e Update syn to 2 (#855)
• 2f1866d Upgrade rocksdb to 0.22 (#853)
• 9ff9316 fix compile errors with new Rust (#854)
• 757e2bd primitive-types: add repository URL to Cargo.toml (#844)
• d5e9c1d Add more comment (#827)
• dbf46ba Release 0.2.0 (#825)
• Additional commits viewable in compare view

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