Update ethereum-types requirement from 0.14.0 to 0.15.1

[dependabot[bot]]

Updates the requirements on ethereum-types to permit the latest version.

Commits

• 21d7963 ethbloom too
• 173a26d ethereum-types too
• 829682b bump dep
• dd54c82 fix rlp changelog
• d50fad2 bump impl-codec
• ab7a762 bump rlp-derive version (#861)
• 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)
• Additional commits viewable in compare view

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