Update all non-major dependencies

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ethereumjs-util	devDependencies	patch	7.0.2 -> 7.0.3
solidity-docgen	devDependencies	patch	0.5.3 -> 0.5.4

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Release Notes

ethereumjs/ethereumjs-util

v7.0.3

Compare Source

This release replaces the keccak and secp256k1 dependencies
(PR #​257)
and instead uses the
ethereum-cryptography
package that uses native JS implementations for cryptographic primitives
and makes use of modern and forward-compatible N-API implementations in Node
wherever possible.

This is part of a larger initiative led by Nomic Labs to improve the developer
experience within the Ethereum developer ecosystem,
see ethereum/js-organization#​18 for context.

Other Changes:

• Added TypeScript definitions for ethjs-util methods,
  PR #​248 and
  PR #​260

OpenZeppelin/solidity-docgen

v0.5.4

Compare Source

• Added a --helpers (-H) option: a path to a file whose exports will be
  registed as handlebars helpers.

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